# A list of open source C++ libraries

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The objective of this page is to build a comprehensive list of open source C++ libraries, so that when one needs an implementation of particular functionality, one needn't to waste time searching on web (DuckDuckGo, Google, Bing etc.).

If you know a library that might be useful to others, please add a link to it here. There are no restrictions on what can be included except that the source of the library must be readily available to download.

The page is provided 'as is' - with the hope of being useful, but without any warranties. Outdated, misleading or wrong links might appear here. If you've noticed one of these, it would be great if you fixed the error.

Libraries: Table Of Contents
Package managers Libraries: Audio CD Fingerprinting Formats Tagging Benchmarking Communication Concurrency Configuration Command Line CSS HOCON JSON TOML XML YAML Containers Cryptography Databases Embedded languages bindings Embedded/Realtime File metadata Financial Calculations Game Engine Architecture General Multimedia Generic GPS Graphic user interface CopperSpice GTK+ Qt U++ Graphics Graphics (3D) Images Formats Plotting Image Processing Internationalization Logging Error handling Math Automata theory Class Library for Numbers Computational geometry Graph theory Linear algebra Machine Learning Numeral Calculations Optimization Symbolic expression manipulations Metaprogramming PDF Physics and Simulations Robotics Perception Serialization Binary serialization Sorting System Terminal Testing Text Coding Diff/Patch Format Parse Search Template Engine Version Control Video Web

# Package managers

Package manager | Description
--- | ---
build2 | An open source (MIT), cross-platform build toolchain that aims to approximate Rust Cargo's convenience for developing and packaging C/C++ projects while providing more depth and flexibility, especially in the build system.
cget | Cmake package retrieval. This can be used to download and install cmake packages.
cmodule | Non-intrusive CMake dependency management.
conan | Decentralized, open-source (MIT), C/C++ package manager.
CPM.cmake | A CMake script that adds dependency management capabilities to CMake. It's built as a thin wrapper around CMake's FetchContent module that adds version control, caching, a simple API and more.
hunter | A CMake driven cross-platform package manager for C/C++ projects.
spack | A package manager for supercomputers, Linux, and macOS. It makes installing scientific software easy. It isn’t tied to a particular language.
teaport | A cocoapods inspired dependency manager.
vcpkg | A C++ package manager for Windows, Linux, and macOS.
xmake | A cross-platform Lua-based C/C++ build tool and package manager.

# Libraries

## Audio

Library | Description | License | Configuration
--- | --- | --- | ---
Aquila | Open-source and cross-platform DSP library for C++11. | MIT | CMake
Essentia | Open-source library and tools for audio and music analysis, description and synthesis (MIR) (Src) | Affero GPLv3 |
FFTW | A library for computing the DFT (SSE/SSE2/AVX/Altivec/ARM Neon). (Src) | GPL-2.0 | CMake
KFR | Fast, modern, C++17, open source, cross-platform DSP/DFT framework, supports Audio resampling, FIR/IIR filters, Biquad, (SSE, AVX, AVX-512, ARM NEON). (Src) | GPL-2.0 | CMake
soundtouch | SoundTouch is an open-source cross-platform audio processing library for changing the Tempo, Pitch and Playback Rates of audio streams or audio files. (Src) | LGPL-2.1 | Makefile

CD

Library | Description | License | Configuration
--- | --- | --- | ---
libkcompactdisc | Library for interfacing with CDs | GPL v2.0 | CMake

Fingerprinting

Library | Description | License | Configuration
--- | --- | --- | ---
chromaprint | Chromaprint is an audio fingerprint library designed to identify near-identical audio. It trades precision and robustness for search performance. Chromaprint can use multiple FFT libraries - FFmpeg, FFTW3, KissFFT or vDSP. (Src) | MIT, LGPL 2.1 | CMake
libmusicbrainz | The MusicBrainz Client Library (libmusicbrainz), also known as mb_client, is a development library geared towards developers who wish to add MusicBrainz lookup capabilities to their applications. The library supports Windows, Linux and Mac OS X (Src) | LGPL-2.1 | CMake
libofa | Open-source audio fingerprint by MusicIP | APL | makefile

Formats

Library | Description | License | Configuration
--- | --- | --- | ---
audiofile | AudioFile Library handles reading and writing audio files in many common formats. (Src) | LGPL-2.1 | makefile
flac | FLAC stands for Free Lossless Audio Codec, meaning that audio is compressed in FLAC without any loss in quality. FLAC stands out as the fastest and most widely supported lossless audio codec, non-proprietary, is unencumbered by patents. | Open Source, BSD, GPL |
libsndfile | Libsndfile is a cross-platform, open-source library for reading and writing files containing sampled sound (such as Windows WAV and the Apple/SGI AIFF format) through one standard library interface. | LGPL v2.0 or v3.0 |

Tagging

Library | Description | License | Configuration
--- | --- | --- | ---
id3lib | An open-source, cross-platform library for reading, writing, and manipulating ID3v1 and ID3v2 tags, and retrieving some basic mp3 header info like bitrate. However, we now recommend moving to taglib :) | LGPL v2 |
taglib | TagLib Audio Metadata Library is a library for reading and editing the meta-data of several popular audio formats: ID3v1, ID3v2 for MP3 files, Ogg Vorbis comments and ID3 tags and Vorbis comments in FLAC, MPC, Speex, WavPack, TrueAudio, WAV, AIFF, MP4 and ASF files. (Src) | LGPL and MPL v1.1 |

## Benchmarking

Library | Description | License | Configuration
--- | --- | --- | ---
benchmark | A library to benchmark code snippets, similar to unit tests | Apache 2.0 | CMake
Celero | Feature-rich C++ Benchmark Authoring Library/Framework. Supports Windows, Linux, and OSX using C++11. | Apache | CMake
gperftools | 'Google Performance Tools' includes a high-performance, multi-threaded malloc implementation plus tools for benchmarking heap allocation and CPU utilization. | BSD 3-Clause "New" or "Revised" | configure
nanobench | Simple, fast, accurate single-header microbenchmarking functionality for C++11/14/17/20. (Src) | MIT | CMake
plf::nanotimer | Lowest-overhead, cross-platform simple timer class for benchmarking. | zlib |

## Communication

Library | Description | License | Configuration
--- | --- | --- | ---
ACE | asynchronous networking, event demultiplexing, messaging |  |
Apache Thrift | The Apache Thrift software framework, for scalable cross-language services development, combines a software stack with a code generation engine to build services that work efficiently and seamlessly between C++, Java, Python, PHP, Ruby, Erlang, Perl, Haskell, C#, Cocoa, JavaScript, Node.js, Smalltalk, OCaml and Delphi and other languages. |  |
Boost.Asio | asynchronous and synchronous networking, timers, serial I/O | BSL-1.0 |
Boost.Beast | HTTP and WebSocket library built on top of Boost.Asio | BSL-1.0 |
Breep | Event based, high-level, peer-to-peer library, allowing users to directly send and receive objects. | European Union Public License 1.1 | CMake
brpc | Industrial-grade RPC framework used throughout Baidu, with 1,000,000+ instances and thousands kinds of services. (Src) (Doc) | Apache 2.0 | CMake
C++ REST SDK | asynchronous HTTP client and listener, asynchronous Stream, URI, JSON | MIT | CMake
cpp-netlib | cpp-netlib: The C++ Network Library | BSL-1.0 | CMake
cppsimpleuri | A modern C++ uri & query parser | MIT | CMake
cpr | a modern C++ HTTP requests library | MIT | CMake
Crow | A header-only C++ micro web framework (inspired by Python Flask) | BSD-3-Clause | CMake
curlpp | C++ wrapper for CURL library |  |
DumaisLib | Various utilities such as WebServer, JSON, WebSocket server, REST framework (a library for creating a REST API in your c++ app) | MIT | Makefile
EasyHttp | A cross-platform HTTP client library with a focus on usability and speed, supporting http response caching and more. | MIT | CMake
eCAL | high performance inter-process communication | Apache 2.0 | CMake
fineftp-server | ftp server library for Windows and Unix | MIT | CMake
gRPC | A modern open-source high performance RPC framework that can run in any environment. |  |
gsoap | C/C++ development toolkit for XML data bindings, fast WSDL/SOAP/XML Web services, WS-Security, JSON/XML-RPC RESTful services |  |
hmbdc | Headers-only, lightweight and high performance C++17 message pub/sub middleware framework/lib |  | Headers-only
HTTPP | Simple, production ready HTTP server built on top of Boost and a client built on top of libcurl. | BSD 2-Clause "Simplified" | CMake, Makefile
IXWebSocket | Open-source WebSocket + HTTP library without dependency, supports SSL and the per message deflate WebSocket extension. | BSD 3-Clause "New" or "Revised" | CMake, Makefile
KCP | A fast and reliable ARQ protocol that helps applications to reduce network latency. | MIT | CMake
libashttp | asynchronous HTTP client library | GNU Lesser General Public v3.0 |
libjson-rpc-cpp | This framework provides cross platform JSON-RPC (remote procedure call) support for C++. It is fully JSON-RPC 2.0 & 1.0 compatible. | MIT | CMake, Conan
libnavajo | C++ framework including a fast multithreaded http server, HTML5 Websockets, SSL, X509 and HTTP authentification, compression, cookies and advanced session management, IPv4 and IPv6 (CeCILL-C). | CeCILL-C FREE SOFTWARE LICENSE AGREEMENT | CMake
libtins | Network packet crafting and sniffing library |  |
LiteNetLibPP | Lightweight reliable UDP library for games | MIT | CMake
mailio | MIME and email library | BSD 2-Clause "Simplified" | CMake
nanomsg | fast message queue, zeromq successor |  |
netif | Header-only C++14 library for getting network addresses on Windows, Linux, macOS, and FreeBSD. | BSD 3-Clause "New" or "Revised" | CMake
nghttp2 | HTTP/2 C Library and tools (server, client, proxy and benchmarking tools) | MIT | CMake, configure
ngrest | Fast and easy in use JSON RESTful Web Services Framework | Apache 2.0 | CMake
nng | fast message queue, nanomsg successor |  |
Oat++ | Web framework: REST-API and Request implementation (Src) (Doc) | Apache 2.0 | CMake
omniORB | the fastest, complete and portable CORBA ORB implementation in C++ |  |
OpenDDS | DDS (Data Distribution Service) implementation |  |
Paho MQTT | Modern C++ client for MQTT from Eclipse |  | CMake
paozhu | C++20 Web Framework Support HTTP/2 ORM WebSocket | MIT | CMake
PcapPlusPlus | Multiplatform C++ network sniffing and packet parsing and crafting framework |  |
POCO | networking: encryption, HTTP; Zip files (Doc) |  |
rest_rpc | modern, simple, easy to use rpc framework |  | CMake
restbed | Restbed framework brings asynchronous RESTful functionality to C++11 applications. | License | CMake
restc-cpp | Takes the pain out of accessing JSON API's from C++. HTTP Client, native C++ class to/from JSON serialization, asynchronous IO trough boost::asio coroutines. C++14. | MIT | CMake
restful_mapper | ORM for consuming RESTful JSON APIs in C++ |  | CMake, Makefile
seastar | High performance server-side application framework, based on C++14/C++17. | Apache 2.0 | CMake, etc.
Silicon | The Silicon C++14 Web Framework: Fast and Robust Web APIs | MIT | CMake
sockpp | A simple, modern C++ socket library | BSD 3-Clause "New" or "Revised" | CMake
stream-client | Lightweight, header-only, Boost-based client-side socket/connector/socket pool/resolver | Apache 2.0 | CMake
tacopie | C++11 TCP Library | MIT | CMake
TAO | CORBA |  |
taox11 | C++11 based CORBA implementation | MIT |
Unicomm | asynchronous networking, high-level TCP communication framework |  |
uvw | libuv wrapper in modern C++ | MIT | CMake
WNetWrap | WinInet wrapper in C++ | MIT |
wvstreams | C++ networking library including UniConf and a convenient D-Bus API | GPL |
zeromq | fast message queue |  |

## Concurrency

Library | Description | License | Configuration
--- | --- | --- | ---
Asyncpp | An asynchronous c++ library that provides various concurrent operations | MIT | CMake
BlockingCollection | A C++11 thread safe collection class modeled after .NET BlockingCollection. |  |
Boost.Atomic | provides atomic data types and operations on these data types, as well as memory ordering constraints required for coordinating multiple threads through atomic variables. | BSL-1.0 |
Boost.Compute | (unofficial) GPU/parallel-computing library for C++ based on OpenCL. | BSL-1.0 | CMake
Boost.Context | A C++11 library that provides a cooperative multitasking abstraction on a single thread. | BSL-1.0 |
Boost.Interprocess | simplifies the use of interprocess communication and synchronization mechanisms and offers a wide range of them: shared memory, memory-mapped files, semaphores, mutexes, condition variables and upgradable mutex types, named versions of the synchronization objects, file locking, message queues. | BSL-1.0 |
Boost.Lockfree | provides non-blocking (aka lock-free) concurrent data structures: a queue, a stack, and a ringbuffer (spsc_queue). | BSL-1.0 |
Boost.MPI | A C++-friendly interface to the standard Message Passing Interface | BSL-1.0 |
Boost.Thread | enables the use of multiple threads of execution with shared data and means for synchronizing data between the threads. | BSL-1.0 |
concurrencpp | Modern concurrency for C++. Tasks, executors, timers and C++20 coroutines. | MIT | CMake
Highway | provides performance-portable, length-agnostic SIMD/vector intrinsics. Supports: SSE3, SSE4, AVX*, NEON, SVE*, WASM SIMD, RISC-V, POWER. (Doc) | Apache-2.0 | CMake
hipSYCL | provides a clang-based toolchain and a runtime SYCL implementation that can run on multiple target devices (NVIDIA/AMD GPU’s, CPU’s) | BSD-2-Clause | CMake
HPX | A general purpose C++ runtime system for parallel and distributed applications of any scale |  |
Intel TBB | Intel® TBB is a cross-platform C++ library for shared memory parallel programming and heterogeneous computing. The library provides: generic parallel algorithms, concurrent containers, a scalable memory allocator, work-stealing task scheduler, and low-level synchronization primitives. (Src) (Doc) | Apache-2.0 or Commercial | CMake, Makefile
KOKKOS | A programming model in C++ for writing performance portable HPC applications |  |
libopenmpi | The Open MPI Project is an open source Message Passing Interface implementation | 3-clause BSD |
libsimdpp | A portable header-only zero-overhead C++ low level SIMD library. | Boost | CMake
MPL | A C++-17-friendly header-only interface to the standard Message Passing Interface | BSD 3-Clause "New" or "Revised" | CMake
MutexGear | Mutex-only synchronization (wheel, rwlock, work queues) | The MutexGear Library | configure, MSVC
OpenMP | The OpenMP API specification for parallel programming |  |
RaftLib | C++17 stream-like concurrent actors that enable parallel data-flow computations | Apache-2.0 | CMake
SObjectizer | A small framework for simplification of development of concurrent and event-driven applications in C++ by using actor and publish-subscribe models. |  |
stdgpu | Efficient STL-like Data Structures on the GPU | Apache 2.0 | CMake
subprocess | C++17/20 cross platform library for running subprocesses | MIT | CMake, Teaport
Taskflow | Parallel Task Programming in Modern C++ | TASKFLOW MIT | CMake
thread_pool | A modern, fast, lightweight thread pool | MIT | CMake
Thrust | STL-like parallel algorithms and data-structures on top of CUDA, TBB, or OpenMP | Apache v2.0, Boost v1.0. | CMake
VexCL | C++ vector expression template library for OpenCL, CUDA, OpenMP | MIT | CMake
ViennaCL | Linear algebra and algorithms with OpenMP, CUDA, and OpenCL backends |  |
Xenium | A header-only C++17 library that provides various concurrent data structures and reclamation schemes. | MIT | CMake

## Configuration

Library | Description | License | Configuration
--- | --- | --- | ---
Boost.Program_options | The library allows to obtain program options, that is (name, value) pairs from the user, via conventional methods such as command line, config file, and environment variables. | BSL-1.0 |
figcone | Read JSON, YAML, TOML, XML or INI configuration by declaring a struct | MS-PL | CMake
gconfmm |  |  |
libconfig |  |  |
libconfini | INI parser |  |
uconfig | Lightweight, header-only, C++17 configuration library | Apache 2.0 | CMake

Command Line

Library | Description | License | Configuration
--- | --- | --- | ---
Boost.Program_options | The library allows to obtain program options, that is (name, value) pairs from the user, via conventional methods such as command line, config file, and environment variables. | BSL-1.0 |
CLI11 | A header-only command line parser for C++11 and beyond that provides a rich feature set with a simple and intuitive interface. | BSD-3-Clause | CMake
cmdlime | A C++17 library for command-line parsing that provides a concise, declarative interface with support for subcommands, validators, and the ability to choose either the GNU, POSIX, or X11 command-line options format. | MS-PL | CMake
cxxopts | A lightweight header-only C++11 (or C++17) command-line arguments parser, supporting the standard GNU style syntax for options. | MIT | CMake
gflags | Library that implements commandline flags processing. It includes built-in support for standard types such as string and the ability to define flags in the source file in which they are used. | BSD | CMake
hbristow/argparse | A slimline C++ class for parsing command-line arguments, with an interface similar to python's class of the same name. | BSD |
morrisfranken/argparse | A lightweight header-only library for parsing command line arguments in an elegant manner. | Apache 2 | CMake
p-ranav/argparse | Single header argument Parser for C++17 | MIT | CMake
tclap | A simple templatized C++ library for parsing command line arguments. The library provides a simple, flexible object-oriented interface. | MIT | CMake

CSS

Library | Description | License | Configuration
--- | --- | --- | ---
mycss | CSS Parser |  |

HOCON

Library | Description | License | Configuration
--- | --- | --- | ---
cpp-hocon | The C++ implementation of the HOCON format developed by Pupplet. |  |

JSON

Library | Description | License | Configuration
--- | --- | --- | ---
ArduinoJson | ArduinoJson |  |
Boost.JSON | JSON parsing, serialization, and DOM in C++11/17 | BSL-1.0 |
CAJUN |  |  |
DAW JSON Link | C++17 static C++ bindings with type checking allowing of parsing directly to user data structures without library allocation, push/pull modes, allocator support, constexpr | BSL 1.0 | CMake
jansson | Jansson is C library for encoding, decoding and manipulating JSON data. |  |
jeayeson | A very sane (header only) C++14 JSON library |  |
jios | JSON Input Output Streams | MIT | CMake
JOST |  |  |
json | Niels Lohmann JSON |  |
JSON Voorhees | Killer JSON for C++ |  |
JSON++ |  |  |
json-cpp |  |  |
json11 | json11 is a tiny JSON library for C++11, providing JSON parsing and serialization. |  |
JsonBox |  |  |
jsoncons | A header-only library for JSON and JSON-like data formats, with JSON Pointer, JSON Patch, JSONPath, CSV, MessagePack, CBOR, BSON, UBJSON. |  |
jsoncpp |  | MIT | CMake, Conan, vcpkg
jsonme-- |  |  |
libjson |  |  |
minijson | C++ DOM-less and allocation-free JSON parsing and serialization |  |
Neyson | Lightweight C++11 JSON Library | BSD-3-Clause | CMake
nosjob | C++98 library for generating and consuming JSON data | MIT | make
qjson |  |  |
rapidjson |  |  |
simdjson | Parsing gigabytes of JSON per second taking advantage of modern micro-architectures and parallelizing with SIMD (Doc) (Kino) | Apache-2.0 | CMake, vcpkg
struct_mapping | Mapping json to and from a c++ structure |  |
ThorsSerializer | JSON/BSON/YAML Input Output Streams | MIT | Makefile
ujson | µjson is a small, C++11, UTF-8, JSON library |  |
yyjson | A high performance JSON library written in ANSI C | MIT | CMake
zoolib | ZooLib is a C++ toolkit. | MIT |

TOML

Library | Description | License | Configuration
--- | --- | --- | ---
toml++ | TOML parser and serializer for C++17 and later |  |
toml11 | TOML parsing library based on C++11 |  |

XML

Library | Description | License | Configuration
--- | --- | --- | ---
ai-xml | Serialize objects to and from XML by adding a single, minimal, function to a class. Uses libxml++ under the hood. |  |
GPDS | General purpose data serializer to serialize objects to and from XML. Uses TinyXML under the hood. |  |
gSOAP | XML data bindings |  |
libxml++ |  |  |
pugixml | Light-weight, simple and fast XML parser for C++ with XPath support | MIT | CMake, Conan
tinyxml |  |  |
tinyxml2 | Another and work in progress of TinyXML. |  |
Xerces |  |  |

YAML

Library | Description | License | Configuration
--- | --- | --- | ---
yaml-cpp |  |  |

## Containers

Library | Description | License | Configuration
--- | --- | --- | ---
Boost.Bimap | a bidirectional maps library that offers associative containers such as `bimap<X,Y>` in which both `X` and `Y` can be used as a key. (Src) | BSL-1.0 |
Boost.Container | a header-only library that implements several well-known containers, including STL-like containers, as well as recursive containers, and new useful containers: `flat_map`, `flat_set`, `flat_multimap`, `flat_multiset`, `stable_vector`, `static_vector`, `small_vector`, `devector`. (Src) | BSL-1.0 |
Boost.Fusion | a library for working with heterogeneous collections of tuples. Provides a set of containers (`vector`, `list`, `set` and `map`), along with transformed presentation of their underlying data, a.k.a views." (Src) | BSL-1.0 |
Boost.Heap | an implementation of priority queues with more functionality and different performance characteristics, than STL has. (Src) | BSL-1.0 |
Boost.Pointer Container | provides containers for holding heap-allocated objects in an exception-safe manner and with minimal overhead. (Src) | BSL-1.0 |
Boost.Tuple | implements pre-C++11 n-`tuple` (a fixed size collection of elements) (Src) | BSL-1.0 |
Boost.Variant | implements pre-C++17 `variant` (a safe, generic, stack-based discriminated `union` container) (Src) | BSL-1.0 |
cpp-btree | header-only; B-tree containers make better use of the CPU cache: `btree_map`, `btree_set`, `btree_multimap`, `btree_multiset`. (Src) | Apache-2.0 | CMake
DataFrame | C++ DataFrame for statistical, Financial, and ML analysis -- in modern C++ using native types and continuous memory storage | BSD-3-Clause | CMake, Makefile, Conan, vcpkg
eggs::variant | Eggs.Variant is a C++11/14/17 generic, type-safe, discriminated union. It is notable in particular for having very good constexpr support. | BSL-1.0 | CMake
Frozen | constexpr perfect-hashing-based frozen sets and maps | Apache-2.0 |
Immer | A library of persistent and immutable data structures | Boost | CMake
plf::colony | Unordered "bag-like" container which outperforms `std::` containers in high-modification scenarios while maintaining valid pointers to non-erased elements regardless of insertion and erasure. C++98/11/14/etc-compatible. See also P0447, std::hive. (Src) | zlib | conan build2
plf::list | std::list implementation which sacrifices range-splicing for cache-friendliness, yielding faster insertion, erasure and iteration. C++98/11/14/etc-compatible. (Src) | zlib |
plf::reorderase | An extension and optimization of the "swap-and-pop"/"move-and-pop" idiom for random access containers to increase random_access container erase performance, when post-erasure order is unimportant. Covers single, range and std::erase_if-style erasures. C++98/11/14/etc-compatible. (Src) | zlib |
plf::queue | Drop-in replacement container for the std::queue container adaptor with better performance than std::deque and std::list in a queue context. C++98/11/14/etc-compatible. (Src) | zlib |
plf::stack | Drop-in replacement container for the std::stack container adaptor with better performance than std::vector and std::deque in a stack context. C++98/11/14/etc-compatible. (Src) | zlib |
ring_span | A header-only lite implementation of Arthur O'Dwyer's `ring_span`, a.k.a. circular buffer view. C++98- compatible. | BSL-1.0 | CMake
strict_variant | A realtime/embedded-friendly (i.e. `-fno-exceptions`/`-fno-rtti` compatible), never-empty `variant` targetting C++11. Fast, prevents many undesirable implicit conversions. | BSL-1.0 | CMake
Ygg | An intrusive C++11 implementation of high-performance containers and data structures such as a Red–black tree, an Interval tree and an Interval Map. | MIT | CMake

## Cryptography

Library | Description | License | Configuration
--- | --- | --- | ---
Botan | Cryptography Toolkit. (Src) | BSD 2-Clause "Simplified" | Makefile
crypto++ | Free C++ Class Library of Cryptographic Schemes. (Src) | Boost | Makefile
gnutls | A secure communications library implementing the SSL, TLS and DTLS protocols and technologies around them. (Src) | LGPL-2.1 | Makefile
openssl | A robust, commercial-grade, full-featured toolkit for general-purpose cryptography and secure communication. (Src) | Apache-2.0 | Makefile
TomCrypt | A fairly comprehensive, modular and portable cryptographic toolkit that provides developers with a vast array of well known published block ciphers, one-way hash functions, chaining modes, pseudo-random number generators, public key cryptography and a plethora of other routines. (Src) | public domain | CMake, Makefile

## Databases

Library | Description | License | Configuration
--- | --- | --- | ---
cpp-redis | C++11 Lightweight Redis client: async, thread-safe, no dependency, pipelining, multi-platform. |  |
DTL |  |  |
EasyQtSql | A lightweight header-only C++11 library for quick and easy SQL querying with QtSql |  |
Galera | The Galera Cluster is the synchronous multi-master replication library (Galera) and a Write Set Replication (WSREP) API for MySQL/MariaDB (Src) | GPLv2 | CMake, Scons
LevelDB | A C++ library developed by Google that handles billion-scale Key-Value data persistence storage. |  |
libpqxx |  |  |
lmdb++ | C++11 wrapper for the LMDB embedded B+ tree database library. |  |
mongocxx | Official C++11 driver library for MongoDB (Doc). It offers optimized APIs for CRUD operations, indexing, and aggregation. Supporting BSON and featuring connection pooling and authentication mechanisms, it provides high-performance and scalable solutions for building C++ applications that leverage MongoDB. | Apache 2.0 | CMake
mysql++ |  |  |
nanodbc | A small, cross-platform, C++14 wrapper for the native C ODBC API | MIT | CMake
ODB | ODB is an open-source, cross-platform, and cross-database object-relational mapping (ORM) system for C++. ODB supports MySQL, SQLite, PostgreSQL, Oracle, and Microsoft SQL Server relational databases as well as C++98/03 and C++11 language standards. | GPL2 and/or NCUEL |
OTL |  |  |
Pgfe | The PostgreSQL client (FrontEnd) API in modern C++ | Zlib | CMake
QTL | A friendly and lightweight C++ database library for MySQL, SQLite and ODBC. |  |
QUINCE | QUeries IN C++ Expressions (ORM+EDSL) | Boost |
QxOrm | Object Relational Mapping (ORM) database library for C++/Qt, supports most common databases, serialization (JSON, binary, XML); standalone multi-threaded HTTP web server | GPLv3 or Proprietary |
redis-cpp | C++17 Lightweight C++ client header-only library for executing Redis commands. |  |
redis-plus-plus | A Redis client written in C++ 11, and supports Redis Sentinel, Redis Cluster, pipeline, transaction, pubsub, connection pool and STL-like interface |  |
SOCI |  |  |
SQLAPI++ |  |  |
SQLiteCPP |  |  |
sqlpp11 |  |  |
taoPQ | Lightweight C++17 PostgreSQL client library | Boost | CMake

## Embedded languages bindings

Library | Description | License | Configuration
--- | --- | --- | ---
AngelScript | A scripting language like C++. | ZLib |
ChaiScript | An easy to use embedded scripting language for C++. | BSD-3-Clause |
ExprTk | A simple to use, easy to integrate and extremely efficient run-time mathematical expression parser and evaluation engine. ExprTk supports numerous forms of functional, logical and vector processing semantics and is very easily extendible. |  |
Jinx | Scripting language designed for videogames. | MIT | CMake
spidermonkey.dev | Mozilla’s JavaScript and WebAssembly Engine. |  |
muparser | Many applications require the parsing of mathematical expressions. The main objective muparser is to provide a fast, easy and secure way of doing this. muparser is an extensible high performance math expression parser library written in C++. | BSD-2-Clause | CMake
PythonQt | Dynamic Python binding for the Qt framework. It offers an easy way to embed the Python scripting language into C++ Qt applications. | LGPL 2.1 |
ScriptCaller | a header only library allowing us to call ruby scripts. |  |
lua | Lightweight multi-paradigm scripting language designed primarily for embedded use. C library. | MIT |
sol2 | A modern header-only C++ library binding to Lua. | MIT | CMake
v8pp | Bind C++ functions and classes into V8 JavaScript engine. |  |

## Embedded/Realtime

Library | Description | License | Configuration
--- | --- | --- | ---
distortos | object-oriented C++ RTOS for microcontrollers |  |
ETL | Embedded Template Library - C++03, Portable template library tailored for low resource (embedded) platforms (Src) | MIT |
QP/C++ | RTOS kernel: Real-Time Embedded Frameworks based on active objects & state machines | GPLv3 |
µcuREST | C++11 REST/JSON server framework for microcontrollers |  |

## File metadata

Library | Description | License | Configuration
--- | --- | --- | ---
exempi |  |  |
exiv2 |  |  |
libkexiv2 |  |  |
rarian |  |  |

## Financial Calculations

Library | Description | License | Configuration
--- | --- | --- | ---
DataFrame | C++ DataFrame for statistical, Financial, and ML analysis -- in modern C++ using native types and continuous memory storage | BSD-3-Clause | CMake, Makefile, Conan
QuantLib | Quantitative finance Library - A free/open-source library for quantitative finance | modified BSD |

## Game Engine Architecture

Library | Description | License | Configuration
--- | --- | --- | ---
Anax |  |  |
BOX2D | Physics engine |  |
EntityPlus |  |  |
EntityX |  |  |
EnTT |  |  |

## General Multimedia

Library | Description | License | Configuration
--- | --- | --- | ---
Kigs-framework | Modular Multi-purpose Cross Platform Framework | MIT |
openFrameworks |  | MIT |
SDL | Simple DirectMedia Layer: cross-platform (Windows, macOS, Linux, iOS, Android, and others), low level access to audio, keyboard, mouse, joystick, and graphics hardware via that platform's graphics API (OpenGL/Direct3D/Metal/Vulkan) (Doc) (Src) | zlib | CMake
SFML | Simple and Fast Multimedia Library; multi-platform (Windows, Linux, macOS and soon Android & iOS); provides a simple interface to ease the development of games and multimedia applications. It is composed of five modules: system, window, graphics (over OpenGL), audio and network. | zlib/png | CMake
SIGIL | Sound, Input, and Graphics Integration Library; mind-bogglingly simple, cross-platform, minimalist library for text, shapes, input, audio, and 2D images. Supported platforms: Windows, Linux and Raspberry Pi | License | CMake

## Generic

Library | Description | License | Configuration
--- | --- | --- | ---
Abseil | An open-source collection of C++ library code from Google designed to augment the C++ standard library. (Doc) (Src) | Apache-2.0 | CMake
Abstract Intrusive Containers | More flexible than Boost.Intrusive, but not STL-compatible. |  |
Au | A C++14-compatible physical units library with no dependencies and a single-file delivery option. Emphasis on safety, accessibility, performance, and developer experience. | Apache 2.0 |
BDE | The Bloomberg Development Environment core libraries from Bloomberg L.P. | Apache |
Better Enums | Reflective enums (enum to string, iteration, etc.) with constexpr support. | BSD |
bitfield.h | Bit-field structure facility, more portable/flexible than the base language facility. |  |
Boost | large collection of generic libraries | BSL-1.0 |
CAF | The C++ Actor Framework (CAF) is an open source C++11 actor model implementation featuring lightweight & fast actor implementations, pattern matching for messages, network transparent messaging, and more | BSD |
Cinder | A community-developed, free and open source library for professional-quality creative coding in C++. (Doc) (Src) | Modified BSD | CMake
CommonPP | Multi-purpose library with a strong emphasis on getting metrics out of a project. | BSD |
composite_op.h | Basic class data member introspection, cumbersome and often non-re-entrant, but sometimes useful. |  |
cpp-mmf | A C++98 library that encapsulates memory-mapped-files for POSIX or Windows |  |
cxxomfort | Backports of C++ features (C++11 to C++03 and C++1y proposals to C++11/C++03). |  |
Dlib | networking, threads, graphical interfaces, data structures, linear algebra, machine learning, XML and text parsing, numerical optimization, Bayesian nets, and numerous other tasks | Boost |
eventpp | eventpp is a C++ event library for callbacks, event dispatcher, and event queue. With eventpp you can easily implement signal and slot mechanism, publisher and subscriber pattern, or observer pattern. | Apache 2.0 |
fcppt | Freundlich's C++ Toolkit (fcppt) is a collection of libraries focusing on improving general C++ code by providing better types and making use of functional programming. |  |
Folly | Facebook open-source library. A crossplatform library of C++14 components designed with practicality and efficiency in mind. (Doc) | Apache-2.0 | CMake, vcpkg
GSL | C++ Core Guidelines Support Library implementation, recommended by Bjarne Stroustrup, Herb Sutter and Co in C++ Core Guidelines | MIT | CMake, vcpkg
gsl-lite | A single-file header-only version of ISO C++ Guideline Support Library (GSL) for C++98, C++11 and later | MIT |
GUL14 | General Utility Library for C++14 from DESY: Often-used utility functions and types, including String utilities, Statistics and Numeric functions, Containers, Debugging means, etc. (Src) | LGPL-2.1 | Meson, vcpkg
History | Modern C++17 Undo/Redo Framework | Unlicense |
hspp | An experimental library to bring Haskell Style Programming to C++. | Apache-2.0 | header-only
IP-DOS (tm) | IdeaFarm (tm) Piggyback Distributed Operating System: A general purpose programming environment for the C++ language. | Proprietary Open Source | Open Watcom 2.0
JUCE | An extensive, mature, cross-platform C++ toolkit | GPL |
Kangaru | A dependency injection container for C++11 and C++14 | MIT |
Kerbal | Backports of modern STL facilities to previous standard. More features! More constexpr! | LGPL-3.0 | header-only
libsourcey | Cross-platform C++14 library for high speed networking and media encoding. HTTP, WebSockets, TURN, STUN, Symple and more. | LGPL-2.1 | CMake
LLNL/units | A run-time C++ library for working with units of measurement and conversions between them and with string representations of units and measurements | BSD 3-Clause "New" or "Revised" | CMake
Loki | design patterns |  |
match(it) | A lightweight pattern-matching library for C++17 with macro-free APIs. | Apache-2.0 | header-only
nonstd-lite | Parent of *-lite repositories, a migration path to post-C++11 features for pre-C++11 environments | Boost |
nytl | Generic C++17 header-only utility template library. | Boost |
OnPosix | C++ library providing several abstractions (e.g., threading, networking, logging, IPC, etc.) on POSIX platforms. |  |
Reason | ?? xml, xpath, regex, threads, sockets, http, sql, date-time, streams, encoding and decoding, filesystem, compression | GPL |
SaferCPlusPlus | Safe compatible substitutes for unsafe C++ primitives, including pointers, int and std::vector. | Boost |
Smart Enum | "to_string", "from_string" and more for your enums. | Boost |
units | A compile-time, header-only, dimensional analysis and unit conversion library built on c++14 with no dependencies | MIT |
yaal | Yet Another Abstraction Layer - algorithms, collections, arbitrary precision calculation, generic-DSL grammar driven parsers and more | CC BY-ND-NC 4.0 | CMake
Yato | Modern C++(14/17) cross-platform STL-styled and STL-compatible library with implementing containers, ranges, iterators, type traits and other tools; actors system; type-safe config interface. | Apache-2.0 | CMake
yomm2 | Open multi-methods for C++17 | Boost |

## GPS

Library | Description | License | Configuration
--- | --- | --- | ---
gpsd | gpsd is an open-source, cross-platform (Linux/Unix/BSD flavors, including Android and OS X) GPS-aware set of tools, such as a translator and replicator daemon for GPS devices, AIS radios, and other navigational sensors. gpsd is mostly written in C and Python, but also has C++ wrapper. gpsd is everywhere in mobile embedded systems. Every location-aware Android app is indirectly a gpsd client. (Doc) (Src) | BSD 2-clause | scons

## Graphic user interface

Library | Description | License | Configuration
--- | --- | --- | ---
Dear ImGui | A bloat-free graphical user interface library that is highly optimized. |  |
FLTK | A cross-platform C++ GUI toolkit (Linux, Windows, MacOS) that provides modern GUI functionality, and supports 3D graphics via OpenGL/GLUT. Designed to be small and modular. Includes an UI builder. | LGPL ver.2 |
nana | GUI programming in modern C++ style (Doc) | Boost |
nanogui | Minimalistic cross-platform widget library for OpenGL 3.x or higher (Doc) |  |
OWLNext | Modern update to OWL for writing GUI applications in standard C++ on Windows |  |
tiny file dialogs | a single C C++ cross-platform file (no init, no main loop, 6 modal function calls) |  |
U++ | Cross-platform (Windows, GNU/Linux, macOS) rapid application development framework with bundled IDE. C++17 Compatible. (Doc) (Src) | BSD-3-Clause | Makefile
WxWidgets | A free and open source cross-platform (Windows, GNU/Linux, macOS) C++ framework for writing advanced GUI applications using native controls. (Doc) | Modified LGPL | CMake, Makefile
xtd | Modern C++17/20 framework to create console, GUI and unit tests applications on Windows, macOS, Linux, iOS, and Android. (Src) (Doc) | MIT | CMake

CopperSpice

Library | Description | License | Configuration
--- | --- | --- | ---
CopperSpice | A set of C++ libraries used to develop cross-platform software applications. It uses modern idiomatic C++ and integrates seamlessly with the STL. CopperSpice was derived from the Qt framework. (Doc) (Src) | LGPL-2.1 | CMake
CsSignal | Standalone C++ thread aware signal/slot library | LGPL-2.1 | CMake
CsString | Standalone C++ unicode aware string library | LGPL-2.1 | CMake
libGuarded | Standalone C++ multithreading library for managing access to shared data | LGPL-2.1 | CMake

GTK+

Library | Description | License | Configuration
--- | --- | --- | ---
evince |  |  |
flowcanvas |  |  |
glibmm |  |  |
goocanvasmm |  |  |
gtkmm | A cross-platform C++ interface for the GTK+ GUI library. | LGPL |
libglademm |  |  |
libgnomecanvasmm |  |  |
webkitgtk |  |  |

Qt

Library | Description | License | Configuration
--- | --- | --- | ---
libdbusmenu-qt | A small library designed to make sharing and displaying of menu structures over DBus simple and easy to use. It works for both QT and GTK+ and makes building menus simple. |  |
Qt | (Doc) (Src) |  |
QuickQanava | C++14 network/graph visualization library / Qt node editor. | BSD 2.0 | CMake
qwt5 | Qt Widgets for Technical Applications |  |
qwtplot3d |  |  |

U++

Library | Description | License | Configuration
--- | --- | --- | ---
U++ | U++ is a C++ cross-platform rapid application development framework focused on programmers productivity. It includes a set of libraries (GUI, SQL, etc.), and an integrated development environment. (Src/Bin) | BSD |
upp-components | A collection of 3rd party packages for U++ like TerminalCtrl, MessageCtrl etc.. | BSD-3-Clause |

## Graphics

Library | Description | License | Configuration
--- | --- | --- | ---
bgfx | Powerful cross-platform graphics rendering library, support platforms include Windows Mac Linux iOS Android Web, rendering backend including DX, opengl, metal webgl and so on. |  |
cairomm | A C++ wrapper for the cairo graphics library that is 2D library with support for multiple output devices: X Window, Quartz, Win32, image buffers, PostScript, PDF, SVG, OpenGL (experimental). | LGPL |
dfpsr | 2D, 3D and isometric software renderer with desktop GUI toolkit, minimalistic dependency, designed for long time maintenance and can run without any 3D accelerated drivers | zlib |
gegl | GEGL (Generic Graphics Library) is a data flow based image processing framework, providing floating point processing and non-destructive image processing capabilities. (Src) | LGPL |
io2d | Reference Implementations of P0267, the proposed 2D graphics API for ISO C++ | Boost | CMake
nanovg | 2D drawing library based on openGL/DX/metal. |  |
nux | An OpenGL toolkit | LGPL v3 |
pangomm | is the official C++ interface for the Pango font layout library. (Src) | LGPL v2.1 | Makefile
Skia | is an open-source 2D-graphics library written in C++. Skia Graphics Engine is used in Google Chrome, Chrome OS, Mozilla Firefox, Android, LibreOffice, Flutter, etc. Skia has several back-ends: software rasterization, (PDF) output, OpenGL, SVG, etc. | New BSD |
TXLib | TX Library is a tiny 2D graphics library for Win32 written in C++. |  |
ULIS | Cross-Platform C++14 Library, Generic digital image processing, 2D Software rasterizer, Unlimited image formats (`u8`, `u16`, `u32`, float, double), Custom bit-ordered memory layout, All Photoshop pixel blending modes + 11 additional modes, Color models (RGB, HSL, HSV, CMYK, ...), Color-managed pipelines, Color Space support (icm profiles and device-independant), Optimized algorithms with multithreading, Optimized algorithms with SIMD Extensions (SSE2), Image pools and caches for optimisations, Memory storage of animated image sequences | Custom (free-of-charge for non-commercial purposes only) | CMake

## Graphics (3D)

Library | Description | License | Configuration
--- | --- | --- | ---
assimp | 3D model loading |  |
bgfx | Cross-platform, graphics API agnostic, "Bring Your Own Engine/Framework" style rendering library. |  |
Diligent Engine | A modern cross-platform low-level 3D graphics library. |  |
Epoxy | Modern successor to GLEW. Abstracts difference between some kinds of GL contexts, which makes it sometimes simpler to use than GLEW. Used by GTK+ project since 2015. |  |
G3D | The G3D Innovation Engine is a fully featured, open source, cross platform (Windows, Linus, Mac OS) 3D game engine written in C/C++. G3D is used in commercial games, research papers, simulators, and university courses. It supports real-time and offline hardware rendering, ray tracing, model loading, linear algebra, and GP-computation on GPUs. Supports 3DS, OBJ, MP4, PNG, JPG, MD3 and many other formats, includes a native OpenGL skinnable GUI. (Src) (Doc) | BSD-2 |
GLAD | Customizable, lightweight library for loading OpenGL functions |  |
GLEW | OpenGL function loading |  |
GLFW | OpenGL window manager |  |
GLM | Header only C++ mathematics library for rendering |  |
Godot | Full featured multi-platform 2D and 3D game engine in C++17 with a GUI editor written on itself and a python-inspired script language. | MIT | SCons
hlsl++ | Header only C++ math library for rendering using hlsl syntax. Supports SSE and NEON |  |
Horde3D | Horde3D is a small open source 3D rendering engine. It is written in an effort to create a graphics engine that offers the stunning visual effects expected in next-generation games being lightweight and as clean as possible. |  |
Irrlicht | The Irrlicht Engine is an open source realtime 3D engine written in C++. It is cross-platform, using D3D, OpenGL and its own software renderers. |  |
klein | C++11/14/17 SSE-optimized Projective Geometric Algebra library for graphics and animation |  |
Magnum | Lightweight and modular C++11/C++14 graphics middleware for games and data visualization |  |
O3DE | Open-source 3D Engine (former Amazon's Lumberyard) is a C++ multi-platform 3D engine to build AAA games, cinema-quality 3D worlds, and high-fidelity simulations. Includes physics simulation, script engine, networking, and more. (Doc) | Apache 2.0 | CMake
Ogre3D | OGRE - Object-Oriented Graphics Rendering Engine - is a multipurpose visualization library, suitable for scientific visualization, games, simulation, virtual reality and other graphic projetcs. It is multiplatform and very robust, with a good documentation. | MIT | CMake
Open CASCADE | SDK for 3D CAD/CAM/CAE applications |  |
OpenGL | 3D language, graphics and SDK for developing 3D applications. |  |
OpenSceneGraph | OpenSceneGraph is an open source high performance 3D graphics toolkit, used by application developers in fields such as visual simulation, games, virtual reality, scientific visualization and modelling. |  |
Visionaray | A C++ ray tracing template library. |  |
VTK | Visualization Toolkit (VTK) is an open source software for manipulating and displaying scientific data. It comes with state-of-the-art tools for 3D rendering, a suite of widgets for 3D interaction, and extensive 2D plotting capability. |  |
Vulkan | Vulkan is by design a low-level API that removes many of the abstractions found in previous generation graphics APIs. This is great for delivering maximum performance, but has the side effect of exposing more complexity to the developer. Fortunately, several excellent tutorials exist to help clear this hurdle and get productive quickly. |  |

## Images

Library | Description | License | Configuration
--- | --- | --- | ---
Adobe/boost GIL | high-level generic library, focused on algorithms that operate on 2D images. Very limited I/O options. | BSL-1.0 |
agge | Anti-Grain Evolution. 2D graphics engine for Speed and Quality in C++ | MIT | CMake
FreeImage | An Open-Source library project for developers who would like to support popular graphics image formats like PNG, BMP, JPEG, TIFF and others | GPLv2, GPLv3, FIPL |
GraphicsMagick | Reading, writing, and manipulating images in over 88 major formats. Forked from ImageMagick in 2002 | Copyright | Mercurial
SAIL | Reading and writing static, animated, multi-paged images along with their meta data and ICC profiles. Converting capabilities. Targets simplicity and speed. | MIT | CMake
stb | The header-only libraries for C/C++, mostly game-dev oriented. The noteworthy caps: image loader/writer/resizer; font text rasterizer; type-safe containers; ogg vorbis decoder; real-time DXT compressor; Perlin noise generator; lexer for pet DSLs; fast sprintf. | MIT | header-only

Formats

Library | Description | License | Configuration
--- | --- | --- | ---
djvulibre |  |  |
imagemagick |  |  |
Kaitai Struct C++ runtime |  |  |
libraw |  |  |
openexr |  |  |
poppler |  |  |
qimageblitz |  |  |
SVG++ |  |  |

Plotting

Library | Description | License | Configuration
--- | --- | --- | ---
Matplot++ | A gnuplot based C++ Graphics Library for Data Visualization. Matplot++ can take advantage of the following libs: OpenCV, OpenGL, LAPACK, BLAS, FFTW, JPEG, TIFF, ZLIB, PNG, GLAD, GLFW3. (Doc) | MIT | CMake
plotutils | The GNU plotutils package contains libplot, a C/C++ library for exporting 2-D vector graphics in many file formats, both vector and bitmap. libplot can animate 2-D vector graphics and uses a Postscript-like API for file export and graphics animations. | GPL |
sciplot | A modern header-only C++ scientific plotting library powered by gnuplot, with the export to pdf, svg, png, eps, etc. | MIT | CMake, vcpkg

## Image Processing

Library | Description | License | Configuration
--- | --- | --- | ---
dlib |  |  |
Halide | A C++-embedded DSL for high-performance processing of images and tensors. | MIT | CMake, vcpkg
ITK - Insight Toolkit | ITK is an open-source, cross-platform library that provides developers with an extensive suite of software tools for image analysis. Developed through extreme programming methodologies, ITK builds on a proven, spatially-oriented architecture for processing, segmentation, and registration of scientific images in two, three, or more dimensions. | Apache 2.0 | CMake
opencv |  |  |
OTB |  |  |

## Internationalization

Library | Description | License | Configuration
--- | --- | --- | ---
gettext | GNU internationalization library. | GPL | Makefile
ICU | International Components for Unicode is a mature, widely used set of C/C++ libraries providing Unicode and Globalization support for software applications. (Src) | icu4c/LICENSE | Makefile
spirit-po | A small, header-only library which parses po-files and provides an interface similar to GNU libintl. Based on boost::spirit. | BSL-1.0 | Header only
uni-algo | Unicode Algorithms Implementation for C/C++ | MIT/Unlicense | CMake, Conan, vcpkg

## Logging

Library | Description | License | Configuration
--- | --- | --- | ---
Backward | Printing nice Python-styled stack traces with colors and source snippets, especially on crashes. Header-only. | MIT | CMake, Conan
Boost.Log | A cross-platform logging library that is simple to use, extensible, and performant. | BSL-1.0 |
clutchlog | Single-header logging system which targets versatile DEBUGGING instead of service event storage. | BSD | CMake
glog | Google Logging Library for C++98 based on C++-style streams | License | Bazel, CMake, vcpkg
Log4cplus | Cross-platform, C++17 Logging API (modeled after the Java log4j API) providing thread-safe, flexible, and arbitrarily granular control over log management and configuration. | BSD (two clause) or Apache 2.0 | Autotools, CMake, Visual Studio
Log4cpp | A library of C++ classes for flexible logging to files, syslog, IDSA and other destinations. | LGPL |
log4cxx | Apache log4cxx is a logging framework for C++ patterned after Apache log4j. (Src) | Apache | CMake
Pantheios | Diagnostic Logging API library, offering a combination of type-safety, efficiency, genericity and extensibility | BSD-style |
plog | Portable and simple log for C++ in less than 1000 lines of code | MPL-2.0 |
Quill | Cross-platform, C++14 Asynchronous Low Latency Logging Library | MIT | CMake
spdlog | Super fast, header only, C++ logging library | MIT | CMake, Conan

## Error handling

Library | Description | License | Configuration
--- | --- | --- | ---
Boost.LEAF | Lightweight error-handling library for C++11: single-header format, no dependencies, no dynamic memory allocations, can be used with or without exception handling, multi-threading ready. | BSL-1.0 |

## Math

Library | Description | License | Configuration
--- | --- | --- | ---
alglib | ALGLIB is a cross-platform (Windows/POSIX/Linux) numerical analysis and data processing library. ALGLIB features include: Data analysis, Optimization and nonlinear solvers, Interpolation, Linear algebra and linear solvers, FFT and many others. | Free (GPL/Personal/Academic) and Commercial |
ArrayFire | is a cross-platform (Windows/OSX/Linux) general purpose HPC (CPU/GPU/OpenCL/CUDA/GPGPU) library for parallel computing. ArrayFire domains are: Vector Algorithms, Image Processing, Computer Vision, Signal Processing, Linear Algebra, Statistics, and more. (Src) | Custom |
Boost.Math | includes several contributions in the domain of mathematics: Floating Point Utilities, Mathematical Constants, Statistical Distributions and Functions, Statistics, Vector Functionals - Norms, Special Functions, Root Finding & Minimization Algorithms, Polynomials and Rational Functions, Interpolation, Quadrature and Differentiation, Filters, Complex Number Functions, Quaternions, Octonions, Integer Utilities (Greatest Common Divisor and Least Common Multiple), Series, Rationals and Continued Fractions. | BSL-1.0 |
Boost.Random | provides a variety of generators and distributions to produce random numbers having useful properties, such as uniform distribution. | BSL-1.0 |
Boost.SafeNumerics | C++14, header only, Guaranteed Correct Integer Arithmetic, a drop-in replacement for the built-in integer types. | BSL-1.0 |
cpp-measures | A header-only C++11 library to handle physical measures |  |
G+Smo | cross-platform library for isogeometric analysis |  |
GNU MP bignum C++ interface | C++ convenience class interface that offers overloaded functions and operators. The GMP is a free C library for arbitrary precision arithmetic, operating on signed integers, rational and floating-point numbers. | GNU LGPL v3 and GNU GPL v2 |
libmpdec++ | Cross-platform library for correctly-rounded arbitrary precision decimal floating point arithmetic. | BSD-2-Clause | Autoconf, Visual Studio build scripts
NTL | A Library for doing Number Theory. NTL is a high-performance, portable C++ library providing data structures and algorithms for manipulating signed, arbitrary length integers, and for vectors, matrices, and polynomials over the integers and over finite fields. | LGPLv2.1+ |
PCGrand | PCG is a family of simple fast space-efficient statistically good algorithms for random number generation. Unlike many general-purpose RNGs, they are also hard to predict. | Apache |
stats++ | Advanced, comprehensive statistical software: data collection and preprocessing, statistics, machine learning, and optimization, with open C++ source code. |  |
StatsLib | A templated, header-only library of statistical distribution functions. |  |

Automata theory

Library | Description | License | Configuration
--- | --- | --- | ---
yasmine | C++11 UML state machine framework (Doc) (Src) | License |

Class Library for Numbers

Library | Description | License | Configuration
--- | --- | --- | ---
BigNumber | C++ class for creating and computing arbitrary-length integers | Apache 2.0 | CMake
Boost.Multiprecision | The Multiprecision Library provides integer, rational, floating-point, and complex types in C++ that have more range and precision than C++'s ordinary fundamental (built-in) types. | BSL-1.0 |
cln | CLN is a library for efficient computations with all kinds of numbers in arbitrary precision. | GPL |
CNL | Compositional Numeric Library - fixed-precision numeric types | BSL-1.0 | CMake, Conan
Universal Numbers | A C++17/20 template library providing plug-in replacements for the native arithmetic types (integer/decimal/fixed-point/floating-point/posits/logarithmic/interval) | MIT | CMake, Vcpkg, Conan

Computational geometry

Library | Description | License | Configuration
--- | --- | --- | ---
CGAL | Computational geometry algorithms library | GPL-3.0 or commercial | CMake
PCL | Point Cloud library |  |
pmp-library | Polygon Mesh Processing Library |  |
Wykobi | Computational geometry library |  |

Graph theory

Library | Description | License | Configuration
--- | --- | --- | ---
Boost.Graph |  | BSL-1.0 |
CXXGraph | A C++17 Header-Only Library for Graph Representation, Manipulation, Partitioning and Algorithms | AGPL-3.0 | CMake
GTpo | A C++14 directed graphs modelling library, part of QuickQanava project | BSD | QMake, CMake
LEMON | Library for Efficient Modeling and Optimization in Networks implements common data structures and algorithms focusing on combinatorial optimization, graphs and networks. (Doc) | License |
NGraph | A simple (Network) Graph library in C++ |  |
OGDF | Open Graph algorithms and Data structures Framework - is a C++ library for graph algorithms, in particular for automatic graph drawing. | GPL v2 or v3 |

Linear algebra

Library | Description | License | Configuration
--- | --- | --- | ---
Armadillo |  |  |
Blasw | C++11 Header-Only BLAS and Parts of LAPACK Wrapper | BSD-3-Clause | CMake
Blaze |  |  |
Blitz++ |  |  |
Boost.uBLAS |  | BSL-1.0 |
C++ Matrix | High performance and accurate (e.g. edge cases) matrix math library with expression template arithmetic operators | BSD-3-Clause | CMake, Makefile
DecompLib | A header-only C++11 library to decompose a vector into a set of positive definite weighted basis vectors. |  |
Dlib - linear algebra tools |  |  |
Eigen | A C++ template library for linear algebra: matrices, vectors, numerical solvers, and related algorithms. | MPL2 | CMake, Conan
ETL |  |  |
IT++ |  |  |
Matrix | Easy-to-use Scientific Computing library in/for C++ available for Linux and Windows. | MIT | CMake
PETSc | A suite of data structures and routines for the parallel solution of scientific applications modeled by partial differential equations. It supports MPI, and GPUs through CUDA or OpenCL, as well as hybrid MPI-GPU. |  |
Spectra | Sparse Eigenvalue Computation Toolkit as a Redesigned ARPACK is an open-source header-only C++ library for large scale eigenvalue problems, built on top of Eigen linear algebra library (also open-source and header-only). (Src) | MPL-2.0 | CMake, vcpkg
Tense | Fast C++17 Header-Only Expression Template Matrix and Tensor Library | BSD-3-Clause | CMake
xtensor | A C++ library meant for numerical analysis with multi-dimensional array expressions. | BSD |

Machine Learning

Library | Description | License | Configuration
--- | --- | --- | ---
Dlib | machine learning tools |  |
FANN | Fast Artificial Neural Network Library |  |
gaenari | C++17 based incremental decision tree | Apache-2.0 | CMake
liblinear |  |  |
libtorch | C++ frontend to the popular PyTorch Python library (backend is written in C++) | BSD-style | CMake
MLPACK | machine learning package |  |
Shogun | large scale machine learning toolbox |  |
stats++ |  |  |
tensorflow | An Open Source Machine Learning Framework for Everyone; provides stable C++ API and written mainly in C++ | Apache-2.0 |

Numeral Calculations

Library | Description | License | Configuration
--- | --- | --- | ---
LibBF | An arbitrary precision numerical calculation library developed by Bellard with a sample program that calculates pi to billions of bits |  |

Optimization

Library | Description | License | Configuration
--- | --- | --- | ---
ceres-solver | Open-source C++ library for modeling and solving large, complicated optimization problems. It is a feature rich, mature and performant library which has been used in production at Google since 2010. | Apache | CMake, Conan
OptimLib | A C++11 library of numerical optimization methods for nonlinear functions. |  |

Symbolic expression manipulations

Library | Description | License | Configuration
--- | --- | --- | ---
CasADi | Symbolic framework for nonlinear optimization and algorithmic differentiation. Supports C++ code generation for symbolic expressions and dynamic connection of compiled generated code. | LGPLv3.0 | CMake
ExprTk | The C++ Mathematical Expression Toolkit Library (ExprTk) is a simple to use, header-only, easy to integrate and extremely efficient run-time mathematical expression parser and evaluation engine. ExprTk supports numerous forms of functional, logical and vector processing semantics and is very easily extendible. | MIT |
GiNaC | The library is designed to allow the creation of integrated systems that embed symbolic manipulations together with more established areas of computer science (like computation- intense numeric applications, graphical interfaces, etc.) under one roof. | GPLv3 |
mathiu.cpp | A simple computer algebra system in C++17 | Apache-2.0 | CMake
SEMT | Compile time symbolic differentiation | License | Makefile
SymbolicC++ | SymbolicC++ is a general purpose computer algebra system | GPLv2 | Autoconf
SymCC | SymCC is a compiler wrapper which embeds symbolic execution into the program during compilation, and an associated run-time support library. In essence, the compiler inserts code that computes symbolic expressions for each value in the program. The actual computation happens through calls to the support library at run time. | GPLv3 | CMake
SymEngine | SymEngine is a standalone fast C++ symbolic manipulation library. | MIT | CMake
ViennaMath | ViennaMath is a symbolic math library that enables a convenient instantiation, manipulation, and evaluation of mathematical expressions at run time and compile time. | MIT | CMake

## Metaprogramming

Library | Description | License | Configuration
--- | --- | --- | ---
Boost.CallableTraits |  | BSL-1.0 |
Boost.Hana | New metaprogramming library for both types and values | BSL-1.0 |
Boost.Metaparse | Compile-time parser library, producing types, values, and metafunctions from compile-time strings | BSL-1.0 |
Boost.Mp11 |  | BSL-1.0 |
Boost.MPL | Original metaprogramming library, targeted at C++03, slow | BSL-1.0 |
Boost.PFR | A header only C++14 library for basic reflection (without macros): visiting members of a user defined type by index, IO streaming. | BSL-1.0 |
Boost.Proto | A library for building expression template-backed EDSLs | BSL-1.0 |
Brigand | Uses eager metafunctions, optimized for best performance |  |
CoMeta | Lightweight, header-only C++14 metaprogramming library |  |
Meta | Uses eager metafunctions, middle ground between metal and brigand wrt performance |  |
Metal | Uses eager metafunctions, 100% SFINAE-friendly |  |
refl-cpp | A modern compile-time reflection library for C++ with support for overloads, templates, attributes and proxies |  |
Refureku | C++17 runtime reflection and code generation library | MIT | CMake
visit_struct | A miniature reflection library, providing structure visitors for C++11/14. Self-contained, 200-400 lines of code depending how you count. |  |

## PDF

Library | Description | License | Configuration
--- | --- | --- | ---
HARU |  |  |
JagPDF |  |  |
PoDoFo |  |  |

## Physics and Simulations

Library | Description | License | Configuration
--- | --- | --- | ---
Bullet | Physics simulation for games, visual effects, robotics and reinforcement learning |  |
HELICS | Co-simulation framework for synchronizing time and exchanging data between different types of simulators | BSD 3-Clause "New" or "Revised" | CMake
ProjectCHRONO | An Open Source Multi-physics Simulation Engine |  |
ReactPhysics3D | C++ physics engine library for 3D simulations and game |  |

## Robotics

Perception

Library | Description | License | Configuration
--- | --- | --- | ---
GTSAM | Sensor Fusion, SLAM, SFM, VO, Computer vision (Src) | BSD | CMake
opencv | Computer vision and perception, Calibration, Feature Matching (Src) (Doc) | BSD, Apache 2 | CMake

## Serialization

Library | Description | License | Configuration
--- | --- | --- | ---
Boost.Serialization |  | BSL-1.0 |
C++ XML objects |  |  |
cereal | C++11 serialization | BSD |
cista | A simple, high-performance, zero-copy C++ serialization & reflection library. (Src) | MIT | CMake
cppcodec | Header-only C++11 library to encode/decode base64, base32 and hex with consistent, flexible API | MIT |
GPDS | General purpose data serializer to serialize objects to and from XML. Uses TinyXML under the hood. |  |
gSOAP | accurate XML serialization |  |
iguana | A modern, universal and easy-to-use serialization engine developed in C++17, based on compile-time Reflection. Supported formats: JSON, XML, user-defined. | Apache-2.0 | CMake
jios | JSON serialization | MIT | CMake
libs11n |  |  |
protobuf |  |  |
rpnx-serial | A library that can (de)serialize types like std::map, std::vector, etc. |  |
Serio | Fast Lightweight Header-only C++ Serialization Library | BSD-3-Clause | CMake
ThorsSerializer | C++ Serialization library for JSON | MIT | Makefile
yaml-cpp |  |  |
YAS | Yet Another Serialization. YAS is C++11 library; no third-party libraries dependencies. Archives can be binary, text, JSON | Boost | Header only

Binary serialization

Library | Description | License | Configuration
--- | --- | --- | ---
binn | A binary serialization library designed to be compact, fast, and easy to use, itself an implementation of the same name format. |  |
blobify | C++17 header-only, infers the serialized layout from the structure definition alone. | Boost | CMake
bson-cxx | C++ implementation in BSON format. |  |
fast_ber | High-performance serialization using BER/DER encoding rules. Encoding layout is defined by ASN.1 schemas. Follows modern C++ practices, written in C++11. |  |
UBjsonCpp | High-performance UBJson read-write library based on C++14 |  |

## Sorting

Library | Description | License | Configuration
--- | --- | --- | ---
Cpp-sort | A collection of various sorting algorithms in a simple package. | MIT |
Indiesort | Templated sort-wrapper function which allows use of std::sort (and other random-access sort methods) with non-random-access containers. It also increases the performance of sorting large types in random-access containers and arrays | zlib |
Timsort | Templated stable sorting function which outperforms quicksort-based algorithms including std::sort, for reversed or semi-sorted data. | MIT |

## System

Library | Description | License | Configuration
--- | --- | --- | ---
Infoware | C++ Library for pulling system and hardware information, without hitting the command line. | Creative Commons v1.0 | CMake

## Terminal

Library | Description | License | Configuration
--- | --- | --- | ---
cli | A cross-platform header-only library for interactive command line interfaces in modern C++. | BSL-1.0 | make, cmake, nmake, vcpkg
cwidget | high-level terminal interface library for C++, modeled on GTK+ and Qt, but using `curses` as its display layer | GPL v2.0 | make
replxx | A readline and libedit replacement that supports UTF-8, syntax highlighting & hints. |  |

## Testing

Library | Description | License | Configuration
--- | --- | --- | ---
bandit | Human-friendly unit testing for C++11. (Src) | MIT | CMake
Boost.Test | A C++03/11/14/17 unit testing library, available on a wide range of platforms and compilers. (Src) | BSL-1.0 | CMake, b2
Catch2 | A modern, C++-native, test framework for unit-tests, TDD and BDD - using C++14, C++17 and later | Boost | CMake
cppunit | C++ port of the famous JUnit framework for unit testing | LGPL-2.1 | Makefile
CUTE | C++ Unit Testing Easier (no reliance on static initialization for registration), integrated into Cevelop for TDD | MIT | Header only
doctest | The lightest feature-rich C++ single-header testing framework for unit tests and TDD | MIT | CMake
ELFspy | Testing in isolation with fakes and spies - Linux only | GPL-2.0 | Makefile
faker-cxx | Modern C++20 Faker library for generating testing data. | MIT | CMake
Google Test | Google Testing and Mocking Framework. (Src) | BSD 3-Clause "New" or "Revised" | Bazel, CMake
lest | A modern, C++11-native, single-file header-only, tiny framework for unit-tests, TDD and BDD (includes C++98 variant). | Boost | CMake
liblittletest | Portable, one file header-only testing framework | LGPL-2.1 | Header only
snitch | Lightweight C++20 testing framework. | Boost | CMake
tunit | Modern c++17 unit testing library on Windows, macOS, Linux, iOS, and Android. Office site | MIT | CMake

## Text

Coding

Library | Description | License | Configuration
--- | --- | --- | ---
strsuite | A C++20 library to manage strings with different encodings | LGPL3.0 | CMake
uchardet | The ability to guess string encoding is basically the same as the uchardet function in Python. | MOZILLA PUBLIC LICENSE v1.1 | CMake
win-iconv | The character set encoding conversion library for Linux and Mac. The Windows implementation of iconv is based on the Win32 Character Set Conversion API. | public domain | CMake

Diff/Patch

Library | Description | License | Configuration
--- | --- | --- | ---
diff_match_patch | Create and apply patches for strings (requires Qt) | Apache 2.0 | qmake

Format

Library | Description | License | Configuration
--- | --- | --- | ---
cfmt | A companion C++ library for the {fmt} to enable text colorization and styling. | public domain | header only
fmt | Open-source formatting library providing a fast and safe alternative to C stdio and C++ iostreams. Prototype for C++20 std::format family. | License | CMake, Conan

Parse

Library | Description | License | Configuration
--- | --- | --- | ---
BNFlite | A single file lightweight grammar parser library | MIT | Header only
PEGTL | Parsing Expression Grammar Template Library | Boost | Header only

Search

Library | Description | License | Configuration
--- | --- | --- | ---
clucene | CLucene is a cross platform, full-featured, open-source indexing and searching engine/API. (Src) (Doc) | LGPL v2.1 | CMake
Step20 | Ukkonen's online algorithm for constructing Suffix tree, Manber's algorithm for constructing Suffix array. | MIT | Header only
xapian | Open-source search engine with indexing facilities (Src) (Doc) | GPL v2+ | make

Template Engine

Library | Description | License | Configuration
--- | --- | --- | ---
inja | Header-only Template Engine for C++17. | MIT | CMake, Conan, vcpkg, etc.
Jinja2C++ | C++14/17 implementation of Jinja2 templates | MPL-2.0 | CMake, Conan

## Version Control

Library | Description | License | Configuration
--- | --- | --- | ---
coo-semver | The C++ operation library for semantic version numbers. |  |
LibGit2 | Version Control System Git's core library. |  |

## Video

Library | Description | License | Configuration
--- | --- | --- | ---
crystalhd |  |  |
gstreamermm |  |  |
libmatroska |  |  |
libVLC |  |  |
mjpegtools |  |  |
OpenH264 | Multi-platform, multi-architecture, open source library which supports H.264 encoding and decoding (Src) | BSD-2 Clause | Meson

## Web

Library | Description | License | Configuration
--- | --- | --- | ---
Chromium Embedded |  |  |
cpp-jwt |  |  |
Drogon | A C++14/17 based HTTP web application framework running on Linux/macOS/Unix/Windows. |  |
ffead-cpp | Framework for Enterprise Application Development in c++, HTTP1/HTTP2/HTTP3 compliant, Supports multiple server backends | Apache 2.0 | CMake
libhttpserver | libhttpserver is a C++ library for building high performance RESTful web servers. libhttpserver is built upon libmicrohttpd to provide a simple API for developers to create HTTP services in C++. | LGPL-v2.1 | autotools
libkcddb |  |  |
liblastfm |  |  |
libmusicbrainz5 |  |  |
libnavajo |  |  |
Molybden | An SDK for building cross-platform C++ desktop apps with HTML/CSS/JS GUI. (Doc) (Src) | License | npm
oatpp | Light and powerful web-framework for IoT and high-performance web-services. Zero-dependency and easy-portable. |  |
QtWebApp | HTTP(s) Server in C++ inspired by Java Servlets |  |
Tufão |  |  |
uri-template | URI Templates expansion and reverse-matching for C++ | Apache 2.0 | CMake
userver | The C++ Asynchronous Framework | Apache 2.0 | CMake
Wt | Widgets and building blocks to build web apps, built-in security, PDF rendering, 2D and 3D painting, ORM, charting, authentication frameworks. (Doc) (Src) | GNU GPL or Commercial |

### See also

### External links

1. | List of C++ unit testing frameworks — at Wikipedia
2. | A curated list of (awesome) header-only C++ libraries — at GitHub
3. | A curated list of (awesome) C++ and C libraries — at GitHub
4. | Boost C++ libraries — at Boost.org

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