Awesome C/C++

A curated list of awesome C/C++ frameworks, libraries, resources, and shiny things. Inspired by awesome-... stuff.

Awesome C/C++
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Contributing

Standard Libraries

C++ Standard Library - including STL Containers, STL Aglorithm, STL Functional, etc.

C++ Standard Library - A collection of classes and functions, which are written in the core language and part of the C++ ISO Standard itself.
Standard Template Library - The Standard Template Library (STL).
C POSIX library - A specification of a C standard library for POSIX systems.
ISO C++ Standards Committee - ISO/IEC JTC1/SC22/WG21 - The C++ Standards Committee. website
The GNU C Library - The purpose of this manual is to tell you how to use the facilities of the GNU C Library.

Frameworks

C++ generic frameworks and libraries.

Apache C++ Standard Library - STDCXX, A collection of algorithms, containers, iterators, and other fundamental components. [retired] [Apache2]
APR - Apache Portable Runtime. Another library of cross-platform utility functions. [Apache2]
ASL - Adobe Source Libraries provides peer-reviewed and portable C++ source libraries. [MIT]
Boost ⚡ - A large collection of generic C++ libraries. [Boost] website
BDE - The BDE Development Environment from Bloomberg Labs. [Apache2]
Cinder - A community-developed, free and open source library for professional-quality creative coding. [BSD]
Cxxomfort - A small, header-only library that backports to C++03 some of the nifty C++11 goodies. [MIT]
Dlib ⚡ - A general purpose cross-platform C++ library designed using contract programming and modern C++ techniques. [Boost]
EASTL - Public part of EA-STL. [BSD]
ffead-cpp - Framework for Enterprise Application Development. [Apache2]
Folly - An open-source C++ library developed and used at Facebook. [Apache2]
JUCE - An all-encompassing C++ class library for developing cross-platform software. [Core-Module: ISC, Rest: GPL2/GPL3/Commercial] website
libPhenom - libPhenom is an eventing framework for building high performance and high scalability systems in C. [Apache2]
LibSourcey - C++11 evented IO for real-time video streaming and high performance networking applications. [LGPL]
LibU - A multiplatform utility library written in C. [BSD]
Loki - A C++ library of designs, containing flexible implementations of common design patterns and idioms. [MIT]
MiLi - Minimal headers-only C++ Library. [Boost]
OpenFrameworks - A cross platform open source toolkit for creative coding in C++. [MIT] website
Qt ⚡ - A cross-platform application and UI framework. [LGPL]
Reason - A cross platform framework designed to bring the ease of use of Java, .Net, or Python to developers who require the performance and strength of C++. [GPL2]
ROOT - A set of OO frameworks with all the functionality needed to handle and analyze large amounts of data in a very efficient way. Used at CERN. [LGPL]
STLport - An exemplary version of STL. [Free]
STXXL - Standard Template Library for Extra Large Data Sets. [Boost]
Ultimate++ - A C++ cross-platform rapid application development framework. [BSD]
uSTL - The small STL library. [MIT]
Windows Template Library - A C++ library for developing Windows applications and UI components. [Public]
Yomm11 - Open multi-methods for C++11. [Boost]

Artificial Intelligence

btsk - Game Behavior Tree Starter Kit. [zlib]
Evolving Objects - A template-based, ANSI-C++ evolutionary computation library which helps you to write your own stochastic optimization algorithms insanely fast. [LGPL]
TensorFlow - An open source software library for numerical computation using data flow graphs [Apache]

Asynchronous Event Loop

Boost.Asio - A cross-platform C++ library for network and low-level I/O programming. [Boost]
libev - A full-featured and high-performance event loop that is loosely modelled after libevent, but without its limitations and bugs. [BSD and GPL]
libevent - An event notification library. [BSD]
libuv - Cross-platform asychronous I/O. [BSD]

Audio

Audio, Sound, Music, Digitized Voice Libraries

FMOD - An easy to use crossplatform audio engine and audio content creation tool for games. [Free for non-commercial/Commercial]
Maximilian - C++ Audio and Music DSP Library. [MIT]
OpenAL - Open Audio Library - A crossplatform audio API. [BSD/LGPL/Commercial]
Opus - A totally open, royalty-free, highly versatile audio codec. [BSD]
SELA - SimplE Lossless Audio. [MIT]
Speex - A free codec for free speech. Obsoleted by Opus. [BSD]
Tonic - Easy and efficient audio synthesis in C++. [Unlicense]
Vorbis - Ogg Vorbis is a fully open, non-proprietary, patent-and-royalty-free, general-purpose compressed audio format. [BSD]

Biology

Bioinformatics, Genomics, Biotech

libsequence - A C++ library for representing and analyzing population genetics data. [GPL]
SeqAn - Algorithms and data structures for the analysis of sequences with the focus on biological data. [BSD/3-clause]
Vcflib - A C++ library for parsing and manipulating VCF files. [MIT]
Wham - Structural variants (SVs) in Genomes by directly applying association tests to BAM files. [MIT]

BitTorrent

jech/dht - BitTorrent DHT library in C. [MIT]
libtorrent (a.k.a. libtorrent-rasterbar) - An efficient feature complete C++ bittorrent implementation. [BSD]
LibTorrent (a.k.a. libtorrent-rakshasa) - BitTorrent library. [GPL]
libutp - uTorrent Transport Protocol library. [MIT]

CLI

Console/Terminal User Interface, Command Line Interface

Boost.Program_options - A library to obtain program options via conventional methods such as command line and config file. [Boost]
docopt.cpp - A library to generate option parser from docstring. [MIT/Boost]
gflags - Commandline flags module for C++. [BSD]
Ncurses - A terminal user interfaces. [MIT]
termbox - A C library for writing text-based user interfaces. [BSD]

Compression

Compression and Archiving Libraries

bzip2 - A freely available, patent free, high-quality data compressor. [BSD]
doboz - Compression library with very fast decompression. [zlib]
PhysicsFS - A library to provide abstract access to various archives. It is intended for use in video games, and the design was somewhat inspired by Quake 3's file subsystem. [zlib]
KArchive - A library for creating, reading, writing and manipulating file archives like zip and tar. It also provides transparent compression and decompression of data, using formats like gzip, via a subclass of QIODevice. [LGPL]
LZ4 - Extremely Fast Compression algorithm. [BSD]
LZHAM - Lossless data compression library with a compression ratio similar to LZMA but with much faster decompression. [BSD]
LZMA ⚡ - The default and general compression method of 7z format. [PublicDomain]
LZMAT - An extremely fast real-time lossless data compression library. [GPL]
miniz - Single C source file Deflate/Inflate compression library with zlib-compatible API, ZIP archive reading/writing, PNG writing. [Unlicense]
Minizip - Zlib with latest bug fixes that supports PKWARE disk spanning, AES encryption, and IO buffering. [zlib]
smaz - Small strings compression library. [BSD]
Snappy - A fast compressor/decompressor. [BSD]
ZLib - A very compact compression library for data streams. [zlib]
zlib-ng - zlib for the "next generation" systems. Drop-In replacement with some serious optimizations. [zlib]
ZZIPlib - Provides read access on ZIP-archives. [MPL/LGPL]

Concurrency

Concurrency and Multithreading

ArrayFire - A general purpose GPU library. [BSD]
Boost.Compute - A C++ GPU Computing Library for OpenCL. [Boost]
Bolt - A C++ template library optimized for GPUs. [Apache2]
ck - Concurrency primitives, safe memory reclamation mechanisms and non-blocking data structures. [BSD]
C++React - A reactive programming library for C++11. [Boost]
Intel TBB - Intel® Threading Building Blocks. [GPL2 with runtime exception]
junction - A library of concurrent data structures in C++. [BSD]
libcds - A C++ library of Concurrent Data Structures. [BSD]
Libclsph - An OpenCL based GPU accelerated SPH fluid simulation library. [MIT]
OpenCL - The open standard for parallel programming of heterogeneous systems.
OpenMP - The OpenMP API.
Thrust - A parallel algorithms library which resembles the C++ Standard Template Library (STL). [Apache2]
HPX - A general purpose C++ runtime system for parallel and distributed applications of any scale. [Boost]
VexCL - A C++ vector expression template library for OpenCL/CUDA. [MIT]

Containers

C++ B-tree - A template library that implements ordered in-memory containers based on a B-tree data structure. [Apache2]
Hashmaps - Implementation of open addressing hash table algorithms in C++. [MIT]
LSHBOX - A c++ toolbox of locality-sensitive hashing (LSH), provides several popular LSH algorithms, also support Python and MATLAB. [GPL]

Cryptography

Cryptography and Encryption Libraries

Bcrypt - A cross platform file encryption utility. Encrypted files are portable across all supported operating systems and processors.
BeeCrypt
Botan - A crypto library for C++. [BSD-2]
Crypto++ - A free C++ class library of cryptographic schemes. [Boost]
GnuPG - A complete and free implementation of the OpenPGP standard. [GPL]
GnuTLS - A secure communications library implementing the SSL, TLS and DTLS protocols. [LGPL2.1]
Libgcrypt
libmcrypt
LibreSSL - A free version of the SSL/TLS protocol forked from OpenSSL in 2014. [?]
libsodium - P(ortable|ackageable) NaCl-based crypto library, opinionated and easy to use. [ISC]
LibTomCrypt - A fairly comprehensive, modular and portable cryptographic toolkit. [WTFPL]
Nettle - A low-level cryptographic library. [LGPL]
OpenSSL - A robust, commercial-grade, full-featured, and Open Source cryptography library. [Apache] websire
retter - A collection of hash functions, ciphers, tools, libraries, and materials related to cryptography.
s2n - An implementation of the TLS/SSL protocols. [Apache]
Tiny AES128 in C - A small and portable implementation of the AES128 ECB encryption algorithm implemented in C. [PublicDomain]

Database

Database Libraries, SQL Servers, ODBC Drivers, and Tools

hiberlite - C++ Object-relational mapping for sqlite3. [BSD]
Hiredis - A minimalistic C client library for the Redis database. [BSD]
LevelDB - A fast key-value storage library. [BSD]
LMDB - Very fast embedded key/value store with full ACID semantics. [OpenLDAP]
LMDB++ - C++11 wrapper for the LMDB embedded database library. [PublicDomain]
MongoDB C Driver - MongoDB client library for C. [Apache2]
MongoDB C++ Driver - C++ driver for MongoDB. [Apache2]
MongoDB Libbson - A BSON utility library. [Apache2]
MySQL++ - A C++ wrapper for MySQL's C API. [LGPL]
redis3m - Wrapper of hiredis with clean C++ interface, supporting sentinel and ready to use patterns. [Apache2]
RocksDB - Embedded key-value store for fast storage from facebook. [BSD]
SQLite - A completely embedded, full-featured relational database in a few 100k that you can include right into your project. [PublicDomain]
upscaledb - An embedded "typed" key/value store with a built-in query interface. [GPLv3]

Debug

Debugging Libraries, Memory Leak and Resource Leak Detection, Unit Testing

benchmark - Google provided small microbenchmark support library. [Apache2]
Boost.Test - Boost Test Library. [Boost]
Catch - A modern, C++-native, header-only, framework for unit-tests, TDD and BDD. [Boost]
Celero - C++ Benchmarking Framework. [Apache2]
CUTE - C++ Unit Testing Easier. [LGPL3]
CMocka - unit testing framework for C with support for mock objects. [Apache2]
CppUnit - C++ port of JUnit. [LGPL2]
CTest - The CMake test driver program. [BSD]
Google Mock - A library for writing and using C++ mock classes. [BSD]
Google Test - Google C++ Testing Framework. [BSD]
ig-debugheap - Multiplatform debug heap useful for tracking down memory errors. [BSD]
libtap - Write tests in C. [GPL2]
MemTrack - Tracking memory allocations in C++.
microprofile - Profiler with web-view for multiple platforms. [PublicDomain]
minUnit - A minimal unit testing framework for C written using only 2 macros. [PublicDomain]
Mockator - Eclipse CDT plug-in for C++ Seams and Mock Objects.
Remotery - Single C File Profiler with Web Viewer. [Apache2]
UnitTest++ - A lightweight unit testing framework for C++. [MIT/X Consortium license]
VLD - Visual Leak Detector. A free, robust, open-source memory leak detection system for Visual C++.

Game Engine

Allegro - A cross-platform library mainly aimed for video games and multimedia programming. [zlib]
Cocos2d-x - A multi-platform framework for building 2d games, interactive books, demos and other graphical applications. [Commercial?]
delta3d - A robust simulation platform. [LGPL2]
GamePlay - A cross-platform native C++ game framework for creating 2D/3D mobile and desktop games. [Apache2]
Godot - A fully featured, open source, MIT licensed, game engine. [MIT]
Grit - Community project to build a free game engine for implementing open world 3D games. [MIT]
Oxygine - A cross-platform 2D C++ game engine. [MIT]
Panda3D - A game engine, a framework for 3D rendering and game development for Python and C++ programs. [Modified BSD] website
Polycode - A cross-platform framework for creative code in C++ (with Lua bindings). [MIT] website
Torque2D - An open-source and cross-platform C++ engine built for 2D game development. [MIT] website
Torque3D - An open-source C++ engine built for 3D game development. [MIT] website

GUI

Graphic User Interface

CEGUI - Flexible, cross-platform GUI library.
FLTK - Fast, light, cross-platform C++ GUI toolkit. [GPL2]
GacUI - GPU Accelerated C++ User Interface, with WYSIWYG developing tools, XML supports, built-in data binding and MVVM features. [Ms-PL]
GTK+ - A multi-platform toolkit for creating graphical user interfaces. [LGPL]
gtkmm - The official C++ interface for the popular GUI library GTK+. [LGPL]
imgui - Immediate Mode Graphical User Interface with minimal dependencies. [MIT]
libRocket - libRocket is a C++ HTML/CSS game interface middleware. [MIT]
MyGUI - Fast, flexible and simple GUI. [MIT]
QCustomPlot - Qt plotting widget without further dependencies. [GPLv3]
Qwt - Qt Widgets for Technical Applications. [Own based on LGPL]
QwtPlot3D - A feature-rich Qt/OpenGL-based C++ programming library, providing essentially a bunch of 3D-widgets. [zlib]
OtterUI - OtterUI is a User Interface development solution for embedded systems and interactive entertainment software. [MIT]
PDCurses - Public domain curses library with both source code and pre-compiled library available. [PublicDomain]
Sciter - Sciter is an embeddable HTML/CSS/scripting engine aimed to be used as an UI layer of modern desktop applications. [Free/Commercial]
wxWidgets - A C++ library that lets developers create applications for Windows, Mac OS X, Linux and other platforms with a single code base. [Own LGPL]

Graphics

bgfx - A cross-platform rendering library. [BSD]
Cairo - A 2D graphics library with support for multiple output devices. [LGPL2 or Mozilla MPL]
GLFW - A simple, cross-platform OpenGL wrangling library. [zlib/libpng]
Horde3D - A small 3D rendering and animation engine. [EPL]
Irrlicht - A high performance realtime 3D engine written in C++. [zlib]
magnum - C++11 and OpenGL 2D/3D graphics engine. [MIT] website
Ogre 3D ⚡ - A scene-oriented, real-time, flexible 3D rendering engine (as opposed to a game engine) written in C++. [MIT]
OpenSceneGraph - An open source high performance 3D graphics toolkit. [OSGPL]
OpenSubdiv - Pixar's library for evaluating and rendering subdivision surfaces on CPU and GPU. [Modified Apache2]
OpenVDB - Library and tools for storing, editing, and rendering volumetric datasets. [MPL2]
Panda3D - A framework for 3D rendering and game development for Python and C++. [BSD]
Partio - Library for wrangling particle data, with support for most common file formats. [Modified BSD]
Skia - A complete 2D graphic library for drawing Text, Geometries, and Images. [BSD] webpage
urho3d - Cross-platform rendering and game engine. [Many different, mostly MIT]

Image Processing

Boost.GIL - Generic Image Library.
CImg - A small, open source, C++ toolkit for image processing. [Own LGPL or GPL]
CxImage - An image processing and conversion library to load, save, display, transform BMP, JPEG, GIF, PNG, TIFF, MNG, ICO, PCX, TGA, WMF, WBMP, JBG, J2K images. [zlib]
FreeImage - An open source library that supports popular graphics image formats and others as needed by today's multimedia applications. [GPL2 or GPL3]
GD - GD Graphics Library, famously used in PHP for image loading/manipulation & thumbnail generation. [custom permissive license, requires mention in user docs] website
GDCM - Grassroots DICOM library.
ITK - An open-source, cross-platform system for image analysis. [Apache2 from ITK 4.0]
libvips - A fast image processing library with low memory needs. [LGPL] website
Magick++ - ImageMagick program interfaces for C++. [Apache2]
MagickWnd - ImageMagick program interfaces for C. [Apache2]
OpenCV ⚡ - Open source computer vision. [BSD]
OpenEXR - Cross-platform library for high dynamic range imaging. [Modified BSDF]
OpenImageIO - Powerful image and texture wrangling library with support for a wide number of common lossy and RAW formats. [Modified BSD]
tesseract-ocr - An OCR engine. [Apache2]
Video++ - A C++14 high performance video and image processing library. [MIT]
VIGRA - A generic C++ computer vision library for image analysis. [MIT X11]
VTK - Open-source, freely available software system for 3D computer graphics, image processing and visualization. [BSD]

Internationalization

gettext - GNU `gettext'. [GPL2]
IBM ICU - A set of C/C++ and Java libraries providing Unicode and Globalization support. [ICU]
libiconv - An encoding conversion library between different character encodings. [GPL]

Inter-process communication

Apache Thrift - Efficient cross-language IPC/RPC, works between C++, Java, Python, PHP, C#, and many more other languages. Originally developed by Facebook. [Apache2]
Cap'n Proto - Fast data interchange format and capability-based RPC system. [MIT]
gRPC - A high performance, open source, general-purpose RPC framework. [BSD] website
libjson-rpc-cpp - JSON-RPC framework for C++ servers and clients. [MIT]
nanomsg - A simple high-performance implementation of several "scalability protocols". [MIT] website
simple-rpc-cpp - A simple RPC wrapper generator to C/C++ functions. [BSD]
WAMP - Provides RPC and pub/sub messaging patterns. (various implementations, various languages)
xmlrpc-c - A lightweight RPC library based on XML and HTTP. [BSD]
ZeroMQ - High-speed, modular asynchronous communication library. [LGPL]

JSON

Boost.PropertyTree - A property tree parser/generator that can be used to parse XML/JSON/INI/Info files. [Boost]
frozen - JSON parser and generator for C/C++. [GPL & GPL2]
Jansson - C library for encoding, decoding and manipulating JSON data. [MIT]
jbson - jbson is a library for building & iterating BSON data, and JSON documents in C++14. [Boost]
JeayeSON - A very sane (header only) C++ JSON library. [BSD]
json ⚡ - JSON for Modern C++. [MIT]
JSON++ - A JSON parser in C++. [MIT]
JsonCpp - A C++ library for interacting with JSON. [MIT]
json-parser - Very low footprint JSON parser written in portable ANSI C. [BSD]
json11 - A tiny JSON library for C++11. [MIT]
json-voorhees - JSON library for C++. Support for C++11. No dependencies, fast and dev-friendly. [Apache2]
jute - Very simple C++ JSON Parser. [PublicDomain]
libjson - A JSON parser and printer library in C. easy to integrate with any model. [LGPL]
libjson - Lightweight JSON library. [?]
LIBUCL ⚡ - Universal configuration library parser [?]
PicoJSON - A header-file-only, JSON parser serializer in C++. [BSD]
qt-json - A simple class for parsing JSON data into a QVariant hierarchy and vice versa. [GPLv3]
QJson - A qt-based library that maps JSON data to QVariant objects. [LGPL2]
RapidJSON ⚡ - A fast JSON parser/generator for C++ with both SAX/DOM style API. [MIT]
ujson - µjson is a a small, C++11, UTF-8, JSON library. [MIT]
YAJL - A fast streaming JSON parsing library in C. [ISC]

Logging

Blackhole - Header only attribute-based logging framework, which is designed to be fast, modular and highly customizable. [MIT]
Boost.Log - Designed to be very modular and extensible. [Boost]
easyloggingpp - Single header only C++ logging library. [MIT] website
G3log - Asynchronous logger with Dynamic Sinks. [PublicDomain]
Log4cpp - A library of C++ classes for flexible logging to files, syslog, IDSA and other destinations. [LGPL]
log4cplus - A simple to use C++ logging API providing thread-safe, flexible, and arbitrarily granular control over log management and configuration. [BSD & Apache2]
plog - Portable and simple C++ logging library. [MPL2]
reckless - Low-latency, high-throughput, asynchronous logging library for C++. [MIT]
spdlog - Super fast, header only, C++ logging library.
templog - A very small and lightweight C++ library which you can use to add logging to your C++ applications. [Boost]

Machine Learning

Caffe - A fast framework for neural networks. [BSD]
CCV - C-based/Cached/Core Computer Vision Library, A Modern Computer Vision Library. [BSD]
MeTA - A modern C++ data sciences toolkit. [MIT] website
Minerva - A fast and flexible system for deep learning. [Apache2]
mlpack - A scalable c++ machine learning library. [LGPLv3]
OpenCV ⚡ - Open Source Computer Vision Library. [BSD] website
Recommender - C library for product recommendations/suggestions using collaborative filtering (CF). [BSD]
SHOGUN - The Shogun Machine Learning Toolbox. [GPLv3]
sofia-ml - The suite of fast incremental algorithms for machine learning. [Apache2]

Math

Apophenia - A C library for statistical and scientific computing [GPL2]
Armadillo - A high quality C++ linear algebra library, aiming towards a good balance between speed and ease of use. The syntax (API) is deliberately similar to Matlab. [MPL2]
blaze - high-performance C++ math library for dense and sparse arithmetic. [BSD]
Boost.Multiprecision - provides higher-range/precision integer, rational and floating-point types in C++, header-only or with GMP/MPFR/LibTomMath backends. [Boost]
ceres-solver - C++ library for modeling and solving large complicated nonlinear least squares problems from google. [BSD]
CGal - Collection of efficient and reliable geometric algorithms. [LGPL&GPL]
cml - free C++ math library for games and graphics. [Boost]
Eigen - A high-level C++ library of template headers for linear algebra, matrix and vector operations, numerical solvers and related algorithms. [MPL2]
GLM - Header-only C++ math library that matches and inter-operates with OpenGL's GLSL math. [MIT]
GMTL - Graphics Math Template Library is a collection of tools implementing Graphics primitives in generalized ways. [GPL2]
GMP - A C/C++ library for arbitrary precision arithmetic, operating on signed integers, rational numbers, and floating-point numbers. [LGPL3 & GPL2]
MIRACL - A Multiprecision Integer and Rational Arithmetic Cryptographic Library. [AGPL]
NT2 - A SIMD-optimized numerical template library that provides an interface with MATLAB-like syntax. [Boost]
LibTomMath - A free open source portable number theoretic multiple-precision integer library written entirely in C. [PublicDomain & WTFPL] website
QuantLib - A free/open-source library for quantitative finance. [Modified BSD] website
Versor - A (fast) Generic C++ library for Geometric Algebras, including Euclidean, Projective, Conformal, Spacetime (etc).

Multimedia

GStreamer - A library for constructing graphs of media-handling components. [LGPL]
LIVE555 Streaming Media - Multimedia streaming library using open standard protocols (RTP/RTCP, RTSP, SIP). [LGPL]
libVLC - libVLC (VLC SDK) media framework. [GPL]
QtAv - A multimedia playback framework based on Qt and FFmpeg to write a player easily. [LGPL] website
SDL ⚡ - Simple DirectMedia Layer. [zlib]
SFML ⚡ - Simple and Fast Multimedia Library. [zlib]

Networking

ACE - An OO Network Programming Toolkit in C++. [?MIT?]
Boost.Asio ⚡ - A cross-platform C++ library for network and low-level I/O programming. [Boost]
C++ REST SDK - C++ REST SDK (previously named Casablanca). [Apache2]
Restbed - C++11 Asynchronous RESTful framework. [AGPL]
cpp-netlib - A collection of open-source libraries for high level network programming. [Boost]
cpr - A modern C++ HTTP requests library with a simple but powerful interface. Modeled after the Python Requests module. [MIT] website
Dyad.c - Asynchronous networking for C. [MIT]
libcurl - Multiprotocol file transfer library. [MIT/X derivate license]
libjingle - Google talk voice and P2P interoperability library. [BSD]
Mongoose - Extremely lightweight webserver. [GPL2]
Muduo - A C++ non-blocking network library for multi-threaded server in Linux. [BSD]
net_skeleton - TCP client/server library for C/C++. [GPL2]
nope.c - A C language-based ultra-light software platform for scalable server-side and networking applications. Think node.js for C programmers. [GPL2]
Onion - HTTP server library in C designed to be lightweight and easy to use. [Apache2/GPL2]
POCO ⚡ - C++ class libraries and frameworks for building network- and internet-based applications that run on desktop, server, mobile and embedded systems. [Boost] website
Proxygen - Facebook's collection of C++ HTTP libraries including an easy to use HTTP server. [BSD]
RakNet - A cross platform, open source, C++ networking engine for game programmers. [BSD]
Silicon - A high performance, middleware oriented C++14 http web framework. [MIT]
Tufão - An asynchronous web framework for C++ built on top of Qt. [LGPL2]
WebSocket++ - C++/Boost Asio based websocket client/server library. [BSD]

Physics

Dynamics simulation engines

Box2D - A 2D physics engine for games. [BSD-like]
Bullet - A 3D physics engine for games. [zlib] website
Chipmunk - A fast and lightweight 2D game physics library. [MIT] website
LiquidFun - A 2D physics engine for games. [BSD-like]
Newton Dynamics - An integrated solution for real time simulation of physics environments. [zlib]
ODE - Open Dynamics Engine - An open source, high performance library for simulating rigid body dynamics. [BSD&LGPL]
ofxBox2d - openFrameworks wrapper for Box2D. [BSD-like]
Simbody - High-performance C++ multibody dynamics/physics library for simulating articulated biomechanical and mechanical systems like vehicles, robots, and the human skeleton. [Apache2]

Robotics

MOOS-IvP - A set of open source C++ modules for providing autonomy on robotic platforms, in particular autonomous marine vehicles.
MRPT - Mobile Robot Programming Toolkit. [BSD]
PCL - Point Cloud Library is a standalone, large scale, open project for 2D/3D image and point cloud processing [BSD] website
Robotics Library (RL) - A self-contained C++ library for robot kinematics, motion planning and control. [BSD]
RobWork - A collection of C++ libraries for simulation and control of robot systems. [Apache2]
ROS - Robot Operating System provides libraries and tools to help software developers create robot applications. [BSD]

Scientific Computing

FFTW - A C library for computing the DFT in one or more dimensions. [GPL]
GSL - GNU scientific library. [GPL]

Scripting

ChaiScript - An easy to use embedded scripting language for C++. [BSD] website
Lua - A minimal and fast scripting engine for configuration files and basic application scripting. [MIT]
luacxx - C++11 API for creating Lua bindings. [MIT]
SWIG - A wrapper/interface Generator that let you link your c++ code to Javascript, Perl, PHP, Python, Tcl and Ruby. [GPL/Output not licensed]
V7 - An embedded JavaScript engine. [GPL2]
V8 - A fast JavaScript engine by Google that can be embedded into any C++ application. [BSD]

Serialization

cereal - A C++11 library for serialization. [BSD]
cppcodec - Header-only C++11 library to encode/decode base64, base32 and hex with consistent, flexible API. [MIT]
FlatBuffers - A Memory efficient serialization library. [Apache2]
MessagePack - Efficient binary serialization format "like JSON" for C/C++. [Apache2] website
protobuf - Protocol Buffers - Google's data interchange format. [BSD]
protobuf-c - Protocol Buffers implementation in C. [BSD]
SimpleBinaryEncoding - encoding and decoding application messages in binary format for low-latency applications. [Apache2]

Video

libvpx - VP8/VP9 Codec SDK. [BSD]
FFmpeg - A complete, cross-platform solution to record, convert and stream audio and video. [LGPL2/GPL2]
libde265 - Open h.265 video codec implementation. [LGPL] website
OpenH264 - Open Source H.264 Codec. [BSD] website
Theora - A free and open video compression format. [BSD]

Virtual Machines

CarpVM - "interesting" VM in C. Let's see how this goes. [GPLv3]
MicroPython - Aims to put an implementation of Python 3.x on a microcontroller. [MIT]
TinyVM - A small, fast, lightweight virtual machine written in pure ANSI C. [MIT]

Web Application Framework

Civetweb - Provides easy to use, powerful, C/C++ embeddable web server with optional CGI, SSL and Lua support. [MIT]
CppCMS - A Free High Performance Web Development Framework (not a CMS). [LGPLv3]
Crow - Crow is C++ micro web framework (inspired by Python Flask). [BSD]
Kore - ultra fast and flexible web server / framework for web applications developed in C. [ISC]
libOnion - lightweight library to help you create webservers in C programming language. [LGPLv3]
QDjango - A web framework written in C++ and built on top of the Qt library. Where possible it tries to follow django's API, hence its name. [LGPL]
Wt - A C++ library for developing web applications. [GPL/Commercial]

XML

XML is crap. Really. There are no excuses. XML is nasty to parse for humans, and it's a disaster to parse even for computers. There's just no reason for that horrible crap to exist. - Linus Torvalds

Boost.PropertyTree - A property tree parser/generator that can be used to parse XML/JSON/INI/Info files. [Boost]
Expat - An XML parser library written in C. [MIT]
Libxml2 - The XML C parser and toolkit of Gnome. [MIT]
libxml++ - An XML Parser for C++. [LGPL2]
PugiXML - A light-weight, simple and fast XML parser for C++ with XPath support. [MIT]
RapidXml - An attempt to create the fastest XML parser possible, while retaining useability, portability and reasonable W3C compatibility. [Boost]
TinyXML - A simple, small, minimal, C++ XML parser that can be easily integrating into other programs. [zlib]
TinyXML2 - A simple, small, efficient, C++ XML parser that can be easily integrating into other programs. [zlib]
TinyXML++ - A completely new interface to TinyXML that uses MANY of the C++ strengths. Templates, exceptions, and much better error handling. [MIT]
Xerces-C++ - A validating XML parser written in a portable subset of C++. [Apache2]

Miscellaneous

Useful libraries or tools that don't fit in the categories above or maybe just not categorised yet

access_profiler - A tool to count accesses to member variables in c++ programs. [GPL3]
American fuzzy lop a.k.a. afl-fuzz - Crazy fuzzing tool that automatically discovers bugs given time and minimal example input. [Apache2]
Better Enums - Reflective enums (to string, iteration). Single header. [BSD] website
Better String - An alternative to the string library for C which is more functional and does not have buffer overflow overrun problems. Also includes a C++ wrapper. [BSD, GPL2]
Boost.Signals - An implementation of a managed signals and slots system. [Boost]
C++ Format - Small, safe and fast formatting library for C++. [BSD]
FastFormat - Fast, Safe C++ Formatting inspired by log4j and Pantheios [Simplified BSD]
casacore - A set of c++ core libraries derived from aips++. [LGPL]
CppVerbalExpressions - C++ regular expressions made easy. [MIT]
QtVerbalExpressions - This Qt lib is based off of the C++ VerbalExpressions library. [MIT]
c-smart-pointers - Smart pointers for the (GNU) C programming language. [MIT]
cxx-prettyprint - A pretty printing library for C++ containers. [Boost]
DynaPDF - An easy-to-use PDF generation library. [Commercial]
gcc-poison - A simple header file for developers to ban unsafe C/C++ functions from applications.
HTTP Parser ⚡ - A http request/response parser for C. [MIT]
Klib - Small and lightweight implementations of common algorithms and data structures. [MIT]
libsigc++ - A typesafe callback system for standard C++. [LGPL]
libcpuid - A small C library for x86 CPU detection and feature extraction. [BSD]
libevil - The Evil License Manager. [GPLv3]
libnih - A lightweight library of C functions and structures. [GPL2.1]
libusb - A universal USB library which allows for portable access to USB devices. [LGPL2]
Mach7 - A Pattern-matching library for C++. [BSD]
PCRE - A regular expression C library inspired by the regular expression capabilities in Perl. [BSD]
RE2 - A software library for regular expressions via a finite-state machine using automata theory.
PHP-CPP - A library to build PHP extensions with C++. [Apache2] website
Remote Call Framework - Inter-process communication framework for C++. [GPL2/Commercial]
Scintilla - A free source code editing component. [MIT]
SDS - Simple Dynamic Strings library for C. [BSD]
semver.c - A semver parser and render in ANSI C. [MIT]
Serial Communication Library - Cross-platform, Serial Port library written in C++. [MIT]
sigslot - C++ Signal/Slot Library. [PublicDomain]
SLDR - Super Light DNS Resolver. [GPL2/Commercial]
SLRE - Super Light Regexp engine for C/C++. [GPL2/Commercial]
Stage - Mobile robot simulator. [GPL2]
stb - A range of single-file libraries for C/C++. [PublicDomain]
ub-canaries - A collection of C/C++ programs that try to get compilers to exploit undefined behavior.
VarTypes - A feature-rich, object-oriented framework for managing variables in C++ / Qt4. [LGPL]
ZBar - A barcode scanner library, which allows to scan photos/images/video streams for barcodes and return their value. [LGPL2]
ZXing - An open-source, multi-format 1D/2D barcode image processing library implemented in Java, with ports to other languages. [Apache]

Software

Software for creating a development environment.

Compiler

List of C/C++ compilers

8cc - A Small C Compiler.
c - Compile and execute C "scripts" in one go! [MIT]
Clang - A C compiler for LLVM. Supports C11. Developed by Apple. [NCSA]
GCC - GNU Compiler Collection. Supports C11 and OpenMP. [GNU GPL3]
PCC - A very old C compiler. Supports C99.
Intel C++ Compiler - Developed by Intel.
LLVM - Collection of modular and reusable compiler and toolchain technologies.
Microsoft Visual C++ - MSVC, developed by Microsoft.
Open WatCom - Watcom C, C++, and Fortran cross compilers and tools. [Sybase Open Watcom Public License]
Oracle Solaris Studio - C, C++ and Fortran compiler for SPARC and x86. Supports C++11. Available on Linux and Solaris. [OTN Developer License]
TCC - Tiny C Compiler. [LGPL]

Online Compiler

List of online C/C++ compilers

codepad - An online compiler/interpreter, and a simple collaboration tool.
CodeTwist - A simple online compiler/interpreter, where you can paste your C, C++ or Java code and execute it online and see results.
coliru - Online compiler/shell with support for various C++ compilers.
Compiler Explorer - An interactive compiler with assembly output available.
CompileOnline - Compile and Execute C++ online on Linux.
Ideone - An online compiler and debugging tool which allows you to compile source code and execute it online in more than 60 programming languages.
Rextester - Online compiler which provides several compilers(Clang, GCC, MSVC) and several editors.
Rise4Fun - Online Visual C++ compiler.
Wandbox - An online Clang/GCC compiler with Boost available.

Debugger

List of C/C++ debuggers

Comparison of debuggers - A list of Debuggers from Wikipedia.
GDB - GNU Debugger.
LLDB - The LLDB Debugger.
Metashell - An interactive template metaprogramming shell which includes the MDB metadebugger.
Valgrind - A tool for memory debugging, memory leak detection, and profiling.
x64_dbg - An open-source x64/x32 debugger for windows.

Integrated Development Environment

List of C/C++ nominal IDEs.

Anjuta DevStudio - The GNOME IDE. [GPL3]
AppCode - an IDE for Objective-C, C, C++, and JavaScript development built on JetBrains’ IntelliJ IDEA platform.
Cevelop - Cross-platform C/C++ IDE based on Eclipse CDT with additional plug-ins.
CLion - Cross-platform C/C++ IDE from JetBrains.
Code::Blocks - A free C, C++ and Fortran IDE.
CodeLite - Another cross-plaform, free C/C++ IDE. [GPL2 with an exception for plugins]
color_coded - A vim plugin for libclang-based highlighting. [MIT]
Dev-C++ - A portable C/C++/C++11 IDE.
Eclipse CDT - A fully functional C and C++ IDE based on the Eclipse platform.
Geany - Small, fast, cross-platform IDE. [GPL]
IBM VisualAge - A family of computer integrated development environments from IBM.
Irony-mode - A C/C++ minor mode for Emacs powered by libclang.
juCi++ - Cross-platform, lightweight C++ IDE with libclang integration. [MIT]
KDevelop - A free, open source IDE.
Microsoft Visual Studio - An IDE from Microsoft.
NetBeans - An IDE for developing primarily with Java, but also with other languages, in particular PHP, C/C++, and HTML5.
Qt Creator ⚡ - A cross-platform C++, JavaScript and QML IDE which is part of the SDK for Qt.
rtags - A c/c++ client/server indexer with for integration with emacs based on clang.
Xcode - Developed by Apple.
YouCompleteMe - YouCompleteMe is a fast, as-you-type, fuzzy-search code completion engine for Vim.

Build Systems

Bear - A tool to generate compilation database for clang tooling.
Biicode - Simple, file-based dependency manager.
CMake - Cross-platform free and open-source software for managing the build process of software using a compiler-independent method. [BSD]
CPM - A C++ Package Manager based on CMake and Git.
FASTBuild - High performance, open-source build system supporting highly scalable compilation, caching and network distribution.
MesonBuild - An open source build system meant to be both extremely fast, and, even more importantly, as user friendly as possible.
Ninja - A small build system with a focus on speed.
Scons - A software construction tool configured with Python scipt.
Sconsolidator - Scons build system integration for Eclipse CDT.
tundra - High-performance code build system designed to give the best possible incremental build times even for very large software projects.
tup - File-based build system that monitors in the background for changed files.
Premake - A tool configured with lua scipt to generate project files for Visual Studio, GNU Make, Xcode, Code::Blocks, and more across Windows, Mac OS X, and Linux.

Static Code Analysis

List of tools for improving quality and reducing defects by code analysis

Cppcheck - A tool for static C/C++ code analysis. - source
include-what-you-use - A tool for use with clang to analyze includes in C and C++ source files.
OCLint - A static source code analysis tool to improve quality and reduce defects for C, C++ and Objective-C. - source
Clang Static Analyzer - A source code analysis tool that finds bugs in C, C++, and Objective-C programs.
Linticator - Eclipse CDT integration of Pc-/FlexeLint.
List of tools for static code analysis - A list of tools for static code analysis from Wikipedia.

Coding Style Tools

ClangFormat - A tool to format C/C++/Obj-C code.
Clang-Tidy - Clang-based C++ linter tool.
Uncrustify - Code beautifier.

Resources

Various resources, such as books, websites, and articles for improving your C++ development skills and knowledge.

API Design

Articles

Fantastic C/C++ related articles.

CppCon 2015 Speaker Materials - Speaker materials from CppCon 2015.
CppCon 2014 Speaker Materials - Speaker materials from CppCon 2014.
C++Now 2015 Presentations - Presentation materials presented at C++Now 2015.
C++Now 2014 Presentations - Presentation materials presented at C++Now 2014.
C++Now 2013 Presentations - Presentation materials presented at C++Now 2013.
C++Now 2012 Presentations - Presentation materials presented at C++Now 2012.

Books

Fantastic C/C++ related books.

List of Free C/C++ Books
Free C Books - vhf/free-programming-books/C.
Free C++ Books - vhf/free-programming-books/C++.
6 Free eBooks On C++ Game Programming - Learn how to create graphics And video games in C++.
cppbestpractices - Collaborative Collection of C++ Best Practices.

Coding Style

C++ Core Guidelines - "Official" set of C++ guidelines, reviewed by the author of C++.
C++ Dos and Don'ts - The Chromium Projects > For Developers > Coding Style > C++ Dos and Don'ts.
google-styleguide - Style guides for Google-originated open-source projects.
Google C++ Style Guide
GNU Coding Standard
Linux kernel coding style
LLVM Coding Standards

Talks

CppCon Talks ⚡ - The C++ conference.
Quick game development with C++11/C++14 - CppCon 2014 talk by Vittorio Romeo.
Presentation on Hana for C++Now 2015

Videos

Fantastic C/C++ related videos.

List of C/C++ YouTube Videos
Awesome C Programming Tutorials in Hi Def [HD] - A collection of detailed C Programming Language Tutorials for Beginners and New Programmers.
C++ - by VoidRealms.
C++ Qt Programming - by VoidRealms.
C++ Programming Tutorials Playlist - TheNewBoston Official Buckys C++ Programming Tutorials Playlist.
C++ Programming Tutorials from thenewboston - These are all of thenewboston's C++ programming tutorials.
C++ GUI with Qt Playlist - Official Playlist for thenewboston C++ GUI with Qt tutorials.
C Programming Tutorials - All of TheNewBoston's C programming tutorials are right here.
Bo Qian's playlist - Boost Library, C++ Standard Library, Modern C++, Advanced C++, Advanced STL, ...

Websites

Useful C/C++ related websites.

Standard C++ ⚡ - News, Status & Discussion about Standard C++.
CppCon - The C++ Conference.
C++ reference - C++98, C++03, C++11, C++14 reference.
cplusplus.com - The C++ Resources Network.
C FAQ - C frequently asked questions.
C++ FAQ - C++ frequently asked questions.
C++ FQA Lite - C++ frequently questioned answers.
Guru of the Week - A regular series of C++ programming problems created and written by Herb Sutter.
Meeting C++
C++ Quiz - C++ quiz in which you propose to find errors in code fragments of open source projects.
Udemy C++ Courses and Tutorials
C++ Hints - Every business day hints about most often C/C++ mistakes and ways to solve them from PVS-Studio Team.

Weblogs

Useful C/C++ related weblogs.

Coding For Speed - Coding For Speed DOT COM, Less Execution Time.
Eric Niebler
Sticky Bits
Paul Fultz II's Blog
ridiculousfish - Will It Optimize?
Embedded in Academia

Other Awesome Projects

Collection of useful codes, snippets, ...

algorithms - Algorithms & Data Structures in C++.
c-algorithms - C algorithms library.
C/C++ Awesome Pack - Contains some awesome c++ codes, packed in one.

Other Awesome Lists

Other amazingly awesome lists

lists - List of (awesome) lists curated on GitHub.
awesome-awesomeness - A curated list of awesome awesomeness.
awesome - A curated list of awesome lists.
Awesome C/C++ - getAwesomeness() mirror.
free-programming-books - List of Freely Available Programming Books.
Inqlude - The Qt library archive.
papers-we-love - Papers from the computer science community to read and discuss.
awesome-algorithms - A curated list of awesome places to learn and/or practice algorithms.
awesome-talks - A lot of screencasts, recordings of user group gatherings and conference talks.
Projects - A list of practical projects that anyone can solve in any programming language.
Awesome interview questions - A list of lists of interview questions for the most popular technologies, including C/C++.

Contributing

Please see CONTRIBUTING for details.

License

phongth7/awesome-cpp

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