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Sunday, 28 March 2021

Awesome C


A curated list of awesome C frameworks, libraries, resources and other shiny things.

A curated list of C good stuff. This list contains only open source code (as defined by the linked Open Source Definition), and sellers who aren't evil for physical resources.

This is released under a Creative Commons-Attribution-ShareAlike license, version 4 (SPDX code CC-BY-SA-4.0). You can find its text in the LICENSE file.

An important note: This project does not index anything C++-related; only pure C stuff is considered.

Note for contributors: If you want to make a pull request, please read CONTRIBUTING.md first.

Contents

AI

Computer vision, neural nets, machine learning, and other similar things. Basically, if your university calls it AI, it lives here.

  • ccv - C-based/Cached/Core Computer Vision library; modern computer vision. BSD-3-Clause
  • Cranium - Portable, header-only ANN library in C99. MIT
  • FANN - Fast Artifical Neural Network library; an implementation of neural networks. GPL-2.0-only
  • Genann - Simple ANN in C89, without additional dependencies. Zlib
  • KANN - Two-file ANN library. MIT
  • LibDEEP - Deep learning library. BSD-3-Clause

Benchmarking

Comparing the performance of various subsystems across different chip/system architectures.

Build Systems

Tools that automate the building and testing of projects in C.

  • Autotools - Also known as the GNU build system (automake, autoconf, libtool...) is one of the most widely used build systems (configure && make). GPL-1.0-or-later
  • Autotools project skeleton - A simple autotools skeleton (template) to quickly bootstrap new projects. BSD-2-Clause
  • CMake - Cross-platform family of tools designed to build, package and test software. BSD-3-Clause
  • GNU Make - Tool which controls the generation of executables and other non-source files of a program. GPL-3.0-or-later
  • Meson - Extremely fast, user-friendly build system. Based on Ninja. Apache-2.0
  • Premake - Command-line utility which reads a scripted definition of a software project and uses it to generate project files for Visual Studio and GNU Make. Other targets are also being worked on. BSD-3-Clause
  • SCons - Software construction tool using Python. MIT
  • xmake - Cross-platform build utility. Apache-2.0
  • zproject - Project generator and build system support tool. MPL-2.0

Compilers

Compilers, as well as compiler- and compilation-related tooling.

  • ccache - Compiler cache designed to speed up recompilation. GPL-3.0-or-later
  • Clang - Compiler for LLVM. Supports C11. NCSA
  • cproc - A C11 compiler using QBE as a backend. ISC
  • distcc - Program that allows builds to be distributed among several machines. GPL-2.0-or-later
  • Firm - Library that provides a graph-based intermediate representation, optimizations and assembly code generation suitable for use in compilers. Comes with an example C front-end under the same license. LGPL-2.1-only
  • GCC - Provides a C compiler as part of its compiler set. Supports C11. GPL-3.0-or-later
  • PCC - Venerable compiler. Supports C99. Various licenses, all open source.

Compression

  • blosc - Extremely fast, multi-threaded, meta-compressor library. Various licenses, all open source.
  • Brotli - General-purpose lossless compression algorithm library. Has speeds comparable to DEFLATE, but much higher compression ratios. MIT.
  • clzip - C version of the high-quality data compressor Lzip (LZMA implementation). GPL-2.0-or-later
  • CRoaring - C implementation of Roaring bitmaps. Apache-2.0
  • FiniteStateEntropy - Two highly efficient compression codecs optimized for modern CPUs. BSD-2-Clause
  • DENSITY - Super-fast compression library. BSD-3-Clause
  • heatshrink - Data compression/decompression library for embedded and real-time systems. ISC
  • fast_zlib - Improved zlib, which runs 2 to 10 times faster. BSD-3-Clause
  • fastLZ - Lightning-fast lossless compression library (LZ77 type). Embbedable on small target like ARM Cortex-M families. Source code directly embbedable on your project ( a pair of h/c files), no dynamic memory allocation. MIT
  • huffandpuff - Minimal Huffman encoder and decoder. Public domain.
  • libzip - C library for reading, creating and modifying zip archives. BSD-3-Clause
  • libbzip2 - Patent-free, high-quality data compression library. BSD-4-Clause
  • Lizard - Formerly LZ5; an efficient compressor with fast decompression. Achieves compression ratios comparable with zip and zlib at decompression speeds of 1000MB/s and faster. BSD-2-Clause
  • lz4 - Library for an extremely fast compression algorithm. BSD-2-Clause
  • lzo - Fast data compression library. GPL-2.0-or-later
  • pixz - Parallel, indexed xz compressor. BSD-2-Clause
  • shoco - Compressor for small text strings. MIT
  • SIMDComp - Simple library for compressing lists of integers using binary packing. Makes use of SIMD instructions on x86. BSD-3-Clause
  • smaz - Efficient string compression library. BSD-3-Clause
  • squash - Compression abstraction library, complete with some utilities. MIT
  • TurboPFor - Fastest integer compression. GPL-2.0-or-later
  • TurboRLE - Most efficient run-length encoding. GPL-2.0-or-later
  • zip - Really really small zip archive processing library. Unlicense
  • Zlib - Massively spiffy yet delicately unobtrusive compression library. BSD-3-Clause
  • libarchive - libarchive is a portable, efficient C library that can read and write streaming archives in a variety of formats. BSD-3-Clause
  • zlib-ng - Zlib replacement with optimizations for 'next-generation' systems. BSD-3-Clause
  • Zstandard - Fast, lossless compression algorithm, targeting real-time compression scenarios at zlib-level or better compression ratios. BSD-3-Clause

Concurrency and Parallelism

  • cchan - Small library for channel constructs for inter-thread communication. Public domain.
  • checkedthreads - A simple library for parallelism, with built-in checking for race conditions. BSD-2-Clause
  • ck - Concurrency primitives, safe memory reclamation mechanisms and non-blocking data structures. BSD-2-Clause
  • FCFS RWLock - First-come first-served Readers/Writers lock for POSIX threads. CC0-1.0
  • Libaco - A blazing fast and lightweight C asymmetric coroutine library. Apache-2.0
  • libconcurrent - Concurrent programming library, using coroutines, for C11. BSD-3-Clause
  • libcsp - High performance concurrency C library influenced by the CSP model. MIT
  • libdill - Library which makes structured concurrent programming easy. MIT
  • libhl - Library implementing a thread-safe API to manage a range of data structures. Also provides some supporting functions and structures for concurrent and lockfree programming. LGPL-3.0-only
  • liburcu - Data synchronization library, which scales linearly with the number of cores. LGPL-2.1-or-later
  • mill - Go-style concurrency. MIT
  • oclkit - Two-file OpenCL wrapper. GPL-3.0-or-later
  • OCL-MLA - OpenCL Mid-Level Abstractions. BSD-3-Clause
  • OpenMP - Set of pragmas designed to allow for easy parallelization of code. Standard (licensing not applicable).
  • OpenMPI - Message passing interface implementation. BSD-3-Clause
  • pal - Optimized library for maths, parallel processing and data movement. Apache-2.0
  • pth - Portable implementation for non-preemptive priority-based scheduling for multiple threads of execution. GPL-3.0-or-later
  • pthreads - POSIX thread library. Standard (no license applicable).
  • TinyCThread - Portable, small implementation of the C11 threads API. Zlib

Crypto

Mostly library implementations of well-known cryptographic algorithms or protocols.

  • GNU SASL - Implementation of the Simple Authentication and Security Layer and a few common SASL mechanism. GPL-3.0-or-later
  • GnuTLS - Secure communication library, implementing SSL, TLS and DTLS. LGPL-2.1-or-later
  • libgcrypt - General-purpose cryptography library, with a range of available ciphers. LGPL-2.1-or-later
  • OpenSSL - Implementation of the SSL and TLS protocols. Also includes a cryptography library. Dual Licensed under the OpenSSL License and the SSLeay License.
  • liboqs - Library for quantum-resistant cryptographicl algorithms. MIT
  • libsodium - Modern and easy-to-use crypto library. MIT
  • libtomcrypt - Fairly comprehensive, modular and portable cryptographic toolkit. Public domain.
  • mbed TLS - Another crypto implementation. Apache-2.0
  • MIRACL - Multiprecision Integer and Rational Arithmetic Cryptographic Library; an SDK for elliptic curve cryptography. AGPL-3.0-or-later
  • retter - Collection of hash functions, ciphers, tools, libraries and materials related to cryptography and security. Public domain.
  • s2n - C99 implementation of the TLS/SSL protocols, designed to be simple, fast and with security as a priority. Apache-2.0
  • sphlib - Set of implementations of various hash functions, including several cryptographic ones. MIT
  • trezor-crypto - Heavily optimized crypto algorithms for embedded devices. MIT
  • bfish - A single include C99 Blowfish ECB crypto library. Public domain.

Database

Databases and data stores with C APIs.

Data Structures

  • C-Macro-Collections - Generate simple and generic data structures using macros. MIT
  • CLIST - Simple and lightweight dynamic array implementation. BSD-2-Clause
  • Collections-C - Library of generic data structures. LGPL-3.0-or-later
  • ds - Common Data Structures and Algorithms. MIT
  • igraph - A graph processing library. GPL-2.0-or-later
  • kdtree - Simple library for working with KD-trees. BSD-3-Clause
  • libavl - Library containing a range of self-balancing binary trees. GPL-3.0-or-later
  • libcdada - A small, portable, MACRO-less library for basic data structures (list, set, map, queue...) in C (C++ backend). BSD-2-Clause
  • liblfds - Portable lock-free data structure library. Public domain (more exactly, whatever license you want).
  • libsrt - Soft and hard real-time data structures. BSD-3-Clause.
  • list.h - Implementations for singly linked and doubly linked list functions. GPL-3.0-only
  • M*LIB - Library for generic, but typesafe C containers. Implemented as header-only. BSD-2-Clause
  • offbrand - Collection of generic, reference-counted data structures. MIT
  • PackedArray - Random-access array of tightly packed unsigned integers of any desired width. Has a SIMD-optimized implementation. WTFPL
  • rb3ptr - Red-Black tree. Exposes almost all implementation primitives, so can be used for scenarios like augmentation, multiple compatible ordering functions, and more. MIT
  • uthash - Single-file hash table implementation. BSD-1-Clause
  • vector.h - Header library for typed lists. MIT

Debugging

Because we all have to do it sometimes. Various tools for making debugging easier or better, as well as libraries or code that allows better debugging work.

  • C-Reduce - Tool that takes a large C file with a property of interest and automatically produces a much smaller C file that has the same property. Intended to help create minimal bug-demonstrating cases in complex code. BSD-3-Clause
  • CBMC - C Bounded Model Checker; a tool for verification of array bounds, pointer safety and user-specified assertions. BSD-4-Clause
  • cflow - Analyzes a collection of source files and prints a graph charting control flow in the program. GPL-3.0-or-later
  • Complexity - Tool for measuring the complexity of source code. GPL-3.0-or-later
  • CScout - Source code analyzer and refactoring browser for C programs. GPL-3.0-only
  • DDD - Graphical front-end for a range of command-line debuggers. GPL-3.0-or-later
  • debug - One-header library for easier 'printf debugging'. MIT
  • ESBMC - Efficient SMT-based Bounded Model Checker; a tool for verification of single and multithread programs, user assertions, overflow, and pointer/memory safety. Apache-2.0
  • GDB - GNU Project debugger. GPL-3.0-or-later
  • lldb - LLVM debugger. NCSA
  • rr - Debugger that records non-deterministic executions to allow for deterministic debugging. BSD-2-Clause
  • Valgrind - Range of dynamic analysis tools, including a leak checker. GPL-2.0-only

Documentation Generation

  • Cxref - Generates documentation in either LaTeX, HTML, RTF or SGML. GPL-2.0-only
  • DocOnce - Modestly tagged markup language that can be used to generate a range of formats. BSD-3-Clause
  • Doxygen - De-facto standard tool for generating documentation from annotated sources. Can generate a large range of formats. GPL-2.0-only

Editors

Fancier, IDE-type editors. If you want a programmer's text editor, look elsewhere. Besides, whatever you use most likely supports C anyway.

Embeddable Scripting Engines

When C isn't the right solution, or when you need a more dynamic configration engine:

  • Duktape - Embeddable Javascript engine with a focus on portability and compact footprint MIT.

Frameworks

Big libraries that provide data structures and other stuff you expect of a 'modern' standard library.

  • APR - Apache Portable Runtime; another library of cross-platform utility functions. Apache-2.0
  • C Algorithms - Collection of common algorithms and data structures. ISC
  • CPL - The Common Pipeline Library; a set of libraries designed to be a comprehensive, efficient and robust software toolkit. GPL-2.0-only
  • EFL - Large collection of useful data structures and functions. Various licenses, all open source.
  • klib - Small and lightweight implementations of common algorithms and data structures. MIT
  • libcork - Utility functions and structures, designed for resource-constrained systems. Can be embedded. BSD-3-Clause
  • libnih - Lightweight library of functions and structures. GPL-2.0-only
  • libU - Small library of basic utilities, including memory allocation, string manipulation and logging. BSD-3-Clause
  • PBL - Large library of utilities, featuring data structures, among other things. LGPL-2.1-or-later
  • plibsys - Cross-platform system C library. Zero third-party dependencies, uses only native system calls. MIT
  • qlibc - Simple and powerful library, designed as a replacement for GLib while focusing on being small and light. BSD-2-Clause
  • sc - Common libraries and data structures for C. MIT
  • TBOX - Multi-platform library with a large number of capabilities. Apache-2.0

Game Programming

Engines, libraries and other helpful things specifically for making games.

  • Allegro - Cross-platform, video game development and multimedia library. Zlib
  • AssetKit 🎨 3D asset importer/exporter/util library based on COLLADA/glTF specs MIT
  • astera - C99 Cross Platform 2D Game Library MIT
  • cglm - 📽 Optimized OpenGL/Graphics Math (glm) for C. MIT
  • Chipmunk2D - Fast and lightweight 2D game physics library. MIT
  • cmt - 🎮 C Bindings/Wrappers for Apple's METAL Graphics Framework. MIT
  • Corange - Game engine in pure C. BSD-2-Clause
  • CSFML - Binding for SFML. Zlib
  • Darkplaces - Modified version of the Quake2 engine. GPL-2.0-only
  • Epoxy - Library for handling OpenGL function pointer management. MIT
  • Flecs - A Multithreaded Entity Component System written for C89 & C99 MIT
  • Freecell Solver - Set of libraries and command-line programs for automatically solving FreeCell and some similar variants of card Solitaire. MIT
  • FreeGLUT - Alternative to the OpenGL Utility Toolkit. Allows the creation and management of windows with OpenGL contexts. X11
  • GLFW - Multi-platform library for creating windows with OpenGL contexts. Zlib
  • ioquake3 - Quake3 engine, freed at last. GPL-2.0-only
  • kazmath - Maths library for games. BSD-2-Clause
  • libao - Cross-platform audio library with a wide variety of outputs. GPL-2.0-or-later
  • librg - Pure C99 game networking library for building simple and elegant cross-platform multiplayer client-server solutions. Apache-2.0
  • MATHC - Math library for 2D and 3D programming. ZLib
  • Orx - Portable, lightweight, plugin-based, data-driven, 2D-oriented game engine. Zlib
  • Quake - Quake engine. GPL-2.0-only
  • Quake2 - Quake2 engine. GPL-2.0-only
  • raylib - Simple and easy-to-use library to learn video game programming. Zlib
  • RetroArch - Reference frontend for libretro. GPL-3.0-only
  • SDL2 - Cross-platform library designed to provide low-level access to audio, keyboard, mouse, joystick and graphics hardware via OpenGL. Zlib
  • sdl-gpu - Library for high-performance, modern 2D graphics. Based on SDL. MIT
  • SIGIL - Sound, Input and Graphics Integration Library; a simple alternative to other libraries for doing all those things. Various licenses, all open source.
  • uastar - Minimal A* implementation. ZLib

Graphics

Programmatic manipulation of graphics in C; if you want to make a GUI, the Graphical User Interface section has what you need.

  • AssetKit 🎨 3D asset importer/exporter/util library based on COLLADA/glTF specs MIT
  • Cairo - 2D graphics library. LGPL-2.1-only or MPL-1.1.
  • cmt - 🎮 C Bindings/Wrappers for Apple's METAL Graphics Framework. MIT
  • giflib - Library for reading and writing gif images. MIT
  • graphene - Thin layer of graphical data types. MIT
  • heman - Tiny library of image utilities dealing with height maps, normal maps, distance fields and the like. MIT
  • libcaca - ASCII renderer for terminal-based interfaces. WTFPL
  • libgd - Library for the dynamic creation of images by programmers. MIT
  • libimagequant - Small, portable library for high-quality conversion of RGBA images to 8-bit indexed colour images. GPL-3.0-or-later
  • libjpeg-turbo - Faster library for reading and writing JPEG files. Various licences.
  • libpng - Official PNG reference library. Libpng
  • libRSVG - Library to render SVG files using Cairo. LGPL-2.1-or-later
  • libsixel - Library implementing the SIXEL protocol, allowing beautiful graphics in your terminal. MIT
  • libspng - A simpler interface for reading and writing PNG files. BSD-2-Clause
  • libvips - Image processing library. LGPL-2.1-or-later
  • libxmi - Function library for rasterizing 2D vector graphics. GPL-3.0-or-later
  • lightmapper - Single-file library for lightmap baking, using an existing OpenGL renderer. Public domain.
  • little CMS - A Color Management System. It provides fast transforms between ICC profiles. MIT
  • mozjpeg - Improved JPEG encoder. BSD-3-Clause
  • nanovg - Anti-aliased 2D vector drawing library on top of OpenGL, for UI and visualizations. Zlib
  • OpenGL - Industry standard for high-performance graphics, with a native C binding. Various licenses.
  • PlutoVG - A standalone 2D vector graphics library in C MIT

Graphical User Interface

Widget toolkits, or things meant to be used in a similar way to them.

  • GTK+ - Cross-platform widget toolkit. LGPL-2.1-only
  • IUP - Another cross-platform widget toolkit. MIT
  • nuklear - Small, C89, single-header widget toolkit. Public domain.
  • tinyfiledialogs - Single-file library for simple dialogs. Compatible with many other toolkits and OSes. Zlib
  • Tk - Basic widget toolkit. Part of Tcl/Tk. TCL
  • XForms Toolkit - Widget toolkit designed for the XWindow system. LGPL-2.1-only
  • littlevGL - embedded GUI with easy-to-use graphical elements and low memory footprint. MIT

Hashing

Hash function implementations for non-crypto purposes. Cryptographic hashes can be found in the Crypto section.

  • CLHash - Library implementing the ridiculously fast CLHash hashing function. Only works on Intel Haswell or newer. Apache-2.0
  • HighwayHash - Fast, strong, SIMD-using hash function. Also contains an implementation of SipHash (although this is slower). Apache-2.0
  • SpookyHash - Extremely fast hash function. BSD-3-Clause
  • t1ha - Fast Positive Hash - a portable, fast hash function. BSD-3-Clause
  • xxHash - Extremely fast hashing algorithm. Comes in 32 and 64-bit varieties. BSD-2-Clause

Learning, Reference and Tutorials

Resources for learning C programming in general, or something useful relating to C programming.

Reference resources online

Beginner resources online

Intermediate resources online

Advanced resources online

Online self-study courses

Reference books

Beginner books

Intermediate books

Advanced books

Lexing and Parsing

Libraries specifically for lexical analysis (or lexing) and syntactic analysis (or parsing).

  • flex - Fast lexical analyzer generator. BSD-2-Clause
  • GNU Bison - General-purpose parser generator that converts an annotated context-free grammar into a range of parsers. GPL-3.0-or-later
  • hammer - Parser combinators for binary formats. GPL-2.0-only
  • mpc - Parser combinator library. BSD-2-Clause
  • owl - A parser generator for visibly pushdown languages. MIT
  • re2c - Lexer generator, producing fast lexers, with access to its internals. Public domain.

Memory Management

Whether a different, faster malloc or outright garbage collection, anything to do with managing C memory lives here.

Multimedia

Networking and Internet

Low-level networking and internet-related stuff. If you want something more comprehensive and high-level, you may want the Web Frameworks section.

  • asnlc - Compiler of ASN.1 specifications into C source code. BSD-2-Clause
  • CHL - C Hypertext Library - A library for writing web applications in C. GPL-3.0-only
  • czmq - High-level binding for ZeroMQ. MPL-2.0
  • Dyad.c - Lightweight, easy, asynchronous networking library. MIT
  • GNU adns - Advanced, easy-to-use, asynch-capable DNS client library and utilities. GPL-3.0-or-later
  • gumbo-parser - HTML5 parsing library in C99. Apache-2.0
  • H20 - A new-generation HTTP server. MIT
  • http-parser - HTTP request/response parser. MIT
  • ldns - Library to simplify DNS programming. BSD-3-Clause
  • libcurl - Client-side URL transfer library, supporting a wide range of formats. curl
  • LibEtPan - Mail library providing an efficient network for IMAP, SMTP, POP and NNTP. BSD-3-Clause
  • libev - Yet another event loop. BSD-2-Clause
  • libevent - Event loop replacement for network servers. BSD-3-Clause
  • libhttpd - Library to add basic web server capabilities to an application or embedded device. GPL-2.0-only
  • libhv - Cross platform event loop library. BSD-3-Clause
  • libidn - Implementation of the Stringprep, Punycode and IDNA specifications. GPL-3.0-or-later
  • libmicrohttpd - Small library that makes it easy to run an HTTP server as part of another application. LGPL-2.1-or-later
  • libnl - libnl is a collection of libraries to provie APIs to the Netlink protocol (replacement for ioctl). It's primary use is to communicate with the Linux kernel, to modify networking state (interfaces, routing etc...). LGPL-2.1-only
  • libonion - HTTP server library, designed to be easy to use. Apache-2.0
  • libpcap - API provides to various kernel packet capture mechanism. BSD-3-Clause
  • libquickmail - Library intended to give developers a way to send email from their applications. Supports multiple To/Cc/Bcc recipients and attachments without size limits. GPL-3.0-or-later
  • libsagui - Library for cross-platform HTTP servers. LGPL-3.0-or-later
  • libuhttpd - A very flexible, lightweight and fully asynchronous HTTP server library based on libev and http-parser for Embedded Linux. MIT
  • LibVNCServer - Cross-platform libraries to implement VNC server and/or client functionality. GPL-2.0-or-later
  • libwebsock - Easy-to-use and powerful web socket library. LGPL-3.0-only
  • libzmq - Core ZeroMQ library, a high-performance asynchronous messaging library, aimed at use in distributed or concurrent applications. C API (backend C++) GPL-3.0-or-later with static linking exception
  • lwan - Experimental, scalable, high-performance HTTP server. GPL-2.0-only
  • mongoose - Embedded web server. GPL-2.0-only
  • MQTT-C - A portable MQTT C client for embedded systems and PCs alike. MIT
  • nanomsg - C-based implementation of ZeroMQ. MIT
  • NNG - nanomsg-next-generation - lightweight brokerless messaging. MIT
  • oSip - SIP implementation without additional dependencies. LGPL-2.1-or-later
  • silgy - Asynchronous HTTP(S) engine for C/C++ projects. MIT
  • socket99 - C99 wrapper for the BSD sockets API. ISC
  • twitc - Mini library for interacting with the Twitter OAuth API. MIT
  • uriparser - Strictly RFC 3986-compliant URI parsing and handling library. BSD-3-Clause
  • Wslay - WebSocket library. Implements version 13 of the WebSocket protocol, as described in RFC 6455. MIT
  • zyre - Framework for proximity-based peer-to-peer applications. MPL-2.0

Numerical

  • apophenia - Library for statistical and scientific computing. GPL-2.0-only
  • Arb - Library for arbitrary-precision interval arithmetic. LGPL-2.1-or-later
  • ATLAS - Automatically Tuned Linear Algebra Software. BSD-3-Clause
  • clBLAS - BLAS functions written in OpenCL. Apache-2.0
  • cmathl - Math library with a great variety of mathematical functions with CMake build support. Seeks to be close to C89/C90 compliant for portability. MIT
  • Cuba - Library for multidimensional numerical integration. LGPL-3.0-only
  • fft-c - A high-performance Fourier Transform from netlib's fftpack; wrapped in a user-friendly format MIT
  • FFTW - The Fastest Fourier Transform in the West; a highly optimized fast Fourier transform routine. GPL-2.0-or-later
  • FLINT - Fast Library for Number Theory; a library supporting arithmetic with numbers, polynomials, power series and matrices, among others. GPL-2.0-or-later
  • GLPK - GNU Linear Programming Kit; a package designed for solving large-scale linear programming, mixed integer programming and other related problems. GPL-3.0-or-later
  • GMP - GNU Multple Precision Arithmetic Library; a library for arbitrary-precision arithmetic. GPL-2.0-only or LGPL-3.0-only
  • GNU MPC - Library for complex number arithmetic. LGPL-3.0-or-later
  • GNU MPFR - Library for arbitrary-precision floating-point arithmetic. LGPL-3.0-or-later
  • GNU MPRIA - Portable mathematics library for multi-precision rational interval arithmetic. GPL-3.0-or-later
  • GSL - The GNU Scientific Library; a sophisticated numerical library. GPL-3.0-only.
  • KISS FFT - Simple fast Fourier transform library. BSD-3-Clause
  • LAPACKE - Interface to LAPACK. BSD-3-Clause
  • LibTomMath - Portable, number-theoretic, multiple-precision integer library. Supports algebra, digit manipulation, modular reductions, and various number-theoretic routines. Public domain.
  • LibTomPoly - Polynomial-related maths library. Public domain.
  • PARI/GP - Computer algebra system for number theory; includes a compiler to C. GPL-2.0-or-later
  • PETSc - Suite of data structures and routines for scalable parallel solution of scientific applications modelled by partial differential equations. BSD-2-Clause
  • SCS - Splitting Conic Solver; a numerical optimization package for solving large-scale convex cone problems. MIT
  • SLEPc - Library for the solution of large, sparse eigenvalue problems on parallel computers. LGPL-3.0-only
  • TomsFastMath - Set of optimized maths operations (in assembly), suitable for cryptographic use. Public domain.
  • Yeppp! - Fast, SIMD-optimized mathematical library. BSD-3-Clause

Profiling

Regex

  • Onigmo - Fork of Oniguruma, supporting more advanced regexps. BSD-2-Clause
  • Oniguruma - Regex library supporting a wide range of encodings, and incorporating many security-oriented fixes. BSD-2-Clause
  • PCRE - Implementation of regexes identical to that of Perl 5. BSD-3-Clause
  • SLRE - Super Light Regular Expression library; a small implementation of a subset of Perl regex syntax. GPL-2.0-only
  • TRE - POSIX-compliant, feature-full regex library. BSD-2-Clause

Serialization

  • binn - Binary serialization format, meant to be compact, fast and easy-to-use. Apache-2.0
  • c-capnproto - Implementation of the Cap'n Proto serialization protocol. MIT
  • cmp - Implementation of the MessagePack serialization protocol. MIT
  • flatcc - FlatBuffers compiler and library. Apache-2.0
  • libavro - Implementation of the Avro data serialization system. Apache-2.0
  • mpack - Another implementation of the MessagePack serialization protocol. MIT
  • OPIC - Object Persistence in C; a revolutionary serialization framework, with matching on-disk and in-memory representations. GPL-3.0-or-later
  • protobuf-c - Implementation of Google Protocol Buffer. BSD-2-Clause
  • tpl - Small binary serialization library. MIT
  • xdr - External Data Representation; a standard for data serialization. Standard (no license applicable).
  • pbtools - Google Protocol Buffers C source code generator. MIT

Source Code Collections

Collections of small source code. If you want something big and integrated, check the Frameworks section.

  • CCAN - Modelled after Perl's CPAN, this is a big collection of code that does stuff. The full list is here. Various licenses, all open source.
  • clib - Something of a package manager. Comes with a bunch of libraries of its own. MIT
  • gnulib - Collection of common GNU code. Various licenses, all open source.
  • libdjb - Collection of libraries doing various things. (Apparently) public domain.
  • mmx - Collection of single-header libraries. Various licenses, all open source.
  • par - Bunch of single-file libraries. MIT
  • Snippets - Useful code snippets and header-only libraries. Public domain.
  • stb - Range of single-file libraries. Public domain.
  • tinyheaders - Collection of header-only libraries, primarily oriented toward game development. Zlib

Standard Libraries

Implementations of the (standard-mandated) C standard library.

String Manipulation

Structured File Processing

This includes libraries for things like XML, JSON, CSV, and other similar formats.

CSV

JSON

INI

Others

  • libbson - BSON utility library. Apache-2.0
  • libcbor: CBOR protocol implementation for C and others. MIT
  • libconfuse - Small configuration file parser library. ISC
  • libelf - Simple library for parsing ELF files. MIT
  • libucl - Universal configuration library parser. BSD-2-Clause
  • libxo - Allows an application to generate plain text, XML, JSON and HTML output using a common set of function calls. The application decides at runtime what output style should be produced. BSD-2-Clause

XML

  • Expat - Stream-oriented XML parser. MIT
  • libxml2 - Standards-compliant, portable XML parser. MIT
  • xml - Simple, low-memory-use XML parser / tokenizer. MIT

YAML

Testing

Text Editor Extensions

While practically any decent programmer's text editor supports C, there are some extensions that make it more pleasant. These are labelled by editor.

Tools

Useful programs to help you write and debug C code which are not editors, libraries or compilers.

  • Artistic Style - Fast and small automatic source code formatter that supports C. LGPL-3.0-only
  • address-sanitizer - Fast memory error detector. Apache-2.0
  • c - Compile and execute C "scripts" in one go on the command line. Also has shebang support. MIT
  • c99sh - Run C files using hash-bang. BSD-2-Clause
  • cdecl - Online service to translate C declarations into English and vice versa. Public domain.
  • cinclude2dot - Graphs include dependencies in a project using Graphviz. GPL-1.0-or-later or GPL-2.0-or-later or GPL-3.0-or-later
  • ClangCheck - Static analysis tool, designed to work with Clang. NCSA
  • conan.io - Something of a package manager for C. MIT.
  • Cppcheck - Static analysis tool. Despite the name, works well with C. GPL-3.0-or-later
  • Glade - RAD tool to enable quick development of GTK+ GUIs. GPL-2.0-only
  • GMSL - GNU Make Standard Library; a collection of additional functionality for GNU Make. BSD-3-Clause
  • GNU Global - Source code tagging tool. GPL-3.0-only
  • GPP - General-purpose preprocessor. More versatile than the C preprocessor, but more flexible than m4. LGPL-3.0-or-later
  • Highlight - Converts source code to formatted text with nice highlighting. GPL-3.0-only
  • include-what-you-use - Helps find unecessary inclusions and make suggestions for fixing them. Based on LLVM/Clang (and only works with it). NCSA
  • [incbin][] - Include binary files in your C/C++ applications with ease [Unlicense License][Unlicense License]
  • indent - Formats C source code automatically to make it easier to read. Also converts from one style of source to another. GPL-3.0-or-later
  • SMACK - Modular software verification toolchain and a self-contained software verifier. Currently only works with programs compiled using Clang. MIT
  • unifdef - Removes #ifdef and #if directives with their delimited text without touching any other part of the file. BSD-3-Clause or BSD-2-Clause

Utilities

A 'catch-all' category for anything that doesn't fit well anywhere else.

Web Frameworks

Comprehensive and integrated solutions for building the next brilliant web application in C.

  • facil.io - Mini-framework for web applications. Includes a fast HTTP and Websocket server, and also supports custom protocols. MIT
  • kcgi - CGI and FastCGI library for C ISC.
  • KLone - Fully featured, multi-platform, web application development framework, targeted especially at embedded systems and appliances. BSD-3-Clause
  • Kore - Easy-to-use web application framework for writing scalable web APIs in C. ISC

Windows Environments

Technologies designed to bring Windows into the 21st century with respect to support for C.

  • Cygwin - Designed to emulate a POSIX-compatible environment extensively under Windows. Various licenses, all open source.
  • MinGW-w64 - Minimalist environment for C development on Windows with 64 bit support. Various licenses, all open source.
  • MSYS2 - Minimal SYStem 2; aims to provide support for a POSIX environment on Windows, with a package manager based on Arch Linux's pacman. Packages have individual licenses, otherwise, as MinGW and Cygwin.

from https://github.com/oz123/awesome-c
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