C implementation of MurMur Hashing. [`Public Domain`](https://creativecommons.org/share-your-work/public-domain/)

Hashing updated at 2024-06-26T12:00:21Z

Dissasembly/disassembler framework. [`BSD 3-clause`](https://github.com/aquynh/capstone/blob/master/LICENSE.TXT)

Utilities updated at 2024-06-26T11:26:26Z

Message passing interface implementation. [`3-clause BSD`](https://directory.fsf.org/wiki/License:BSD-3-Clause)

Parallel Programming updated at 2024-06-26T07:38:22Z

Simple neural network library in C. [`Zlib`](https://directory.fsf.org/wiki/License:Zlib)

Utilities updated at 2024-06-26T06:31:21Z

Something of a package manager for C. Comes with a [bunch of libraries of its own](https://github.com/clibs/clib/wiki/Packages). [`Expat`](https://directory.fsf.org/wiki/License:Expat)

Source Code Collections updated at 2024-06-26T05:58:17Z

C99 implementation of the TLS/SSL protocols, designed to be simple, fast and with security as a priority. [`Apache 2.0`](https://directory.fsf.org/wiki/License:Apache-2.0)

Networking and Internet updated at 2024-06-26T01:57:35Z

Google's C standard library, developed for Android. [`3-clause BSD`](https://directory.fsf.org/wiki/License:BSD-3-Clause)

Standard Libraries updated at 2024-06-25T23:31:47Z

Helps find unecessary inclusions and make suggestions for fixing them. Based on LLVM/Clang (and only works with it). [`NCSA`](https://directory.fsf.org/wiki/License:NCSA)

Tools updated at 2024-06-25T16:08:03Z

Modern syntax checking. For C, it can use either GCC or Clang as a back-end. [`GNU GPL3 or later`](http://www.gnu.org/licenses/gpl-3.0.html)

Emacs updated at 2024-06-25T15:38:41Z

Platform-independent Near-Field Communication library. [`GNU LGPL3`](http://www.gnu.org/licenses/lgpl-3.0.html)

Utilities updated at 2024-06-25T10:21:05Z

Small, simple build system with a focus on speed. [`Apache 2.0`](https://directory.fsf.org/wiki/License:Apache-2.0)

Build Systems updated at 2024-06-25T06:56:48Z

Fast compression library (implementation in C++, native bindings to C).

Compression updated at 2024-06-24T19:02:26Z

Minimalistic client library for Redis. [`3-clause BSD`](https://directory.fsf.org/wiki/License:BSD-3-Clause)

Database updated at 2024-06-24T10:46:43Z

Pixz (pronounced pixie) is a parallel, indexing version of `xz`. [`2-clause BSD`](https://directory.fsf.org/wiki/License:BSD-2-Clause)

Compression updated at 2024-06-23T20:04:06Z

Cross platform, lock-free memory allocator. [`Public Domain`](https://creativecommons.org/share-your-work/public-domain/)

Memory Allocators updated at 2024-06-23T19:36:58Z

Collection of utilities for measuring and improving performance. [`3-clause BSD`](https://directory.fsf.org/wiki/License:BSD-3-Clause)

Utilities updated at 2024-06-21T19:54:41Z

Range of single-file libraries for C. [`Public Domain`](https://creativecommons.org/share-your-work/public-domain/)

Frameworks updated at 2024-06-20T13:42:41Z

A cross platform C99 library to get cpu features at runtime. [`Apache 2.0`](https://directory.fsf.org/wiki/License:Apache-2.0)

Utilities updated at 2024-06-18T15:35:10Z

ASCII renderer for terminal-based interfaces. [`WTFPLv2`](http://www.wtfpl.net/txt/copying/)

Graphics updated at 2024-06-18T05:14:25Z

Small XML reading and writing library. No dependencies aside from C standard library. [`Apache 2.0 with exceptions`](https://github.com/michaelrsweet/mxml/blob/master/LICENSE)

XML updated at 2024-06-18T02:06:48Z

Ultra-fast, ultra-compact key-value embedded data store. [`OpenLDAP License`](https://directory.fsf.org/wiki/License:OLDAP-2.7)

Database updated at 2024-06-17T16:07:03Z

Parser for `.ini` files. [`Expat`](https://directory.fsf.org/wiki/License:Expat)

Parsers updated at 2024-06-16T07:24:34Z

Fast memory error detector. [`Apache 2.0`](https://directory.fsf.org/wiki/License:Apache-2.0)

Tools updated at 2024-06-15T21:47:11Z

Build script generator for toolsets like Visual Studio, Xcode, or GNU Make. [`3-clause BSD`](https://directory.fsf.org/wiki/License:BSD-3-Clause)

Build Systems updated at 2024-06-15T20:12:15Z

The Quake engine. [`GNU GPL2.1`](http://www.gnu.org/licenses/old-licenses/gpl-2.0.html)

Engines updated at 2024-06-15T17:16:08Z

Client library for [RabbitMQ](https://www.rabbitmq.com/). [`Expat`](https://directory.fsf.org/wiki/License:Expat)

Utilities updated at 2024-06-13T19:07:59Z

Your friendly e-mail address validation library. [`WTFPLv2`](http://www.wtfpl.net/txt/copying/)

Networking and Internet updated at 2024-06-13T09:03:55Z

Small, clean library for processing UTF-8 Unicode data. [`License`](https://github.com/JuliaStrings/utf8proc/blob/master/LICENSE.md)

String Manipulation updated at 2024-06-07T16:59:11Z

Portable foreign-function interface library. [`Expat`](https://directory.fsf.org/wiki/License:Expat)

Utilities updated at 2024-06-06T03:20:43Z

Implementation of Google Protocol Buffer in C. [`FreeBSD`](https://directory.fsf.org/wiki?title=License:FreeBSD)

Serialization updated at 2024-06-03T13:19:11Z

Game engine in pure C. [`FreeBSD`](https://directory.fsf.org/wiki?title=License:FreeBSD)

Engines updated at 2024-06-03T11:56:44Z

Generic lossless compression algorithm based on LZ77, Huffman coding and 2nd order context modelling [`MIT`](https://raw.githubusercontent.com/atom/atom/master/LICENSE.md)

Compression updated at 2024-05-31T16:11:38Z

Simple and portable (but not inflexible) GUI library. [`MIT`](https://github.com/andlabs/libui/blob/master/LICENSE)

Graphical User Interface updated at 2024-05-29T04:55:35Z

C implementation of a command-line option parser. [`Expat`](https://directory.fsf.org/wiki/License:Expat)

Utilities updated at 2024-05-14T15:06:47Z

Portable MQTT C client for embedded systems and PCs alike. [`MIT`](https://raw.githubusercontent.com/LiamBindle/MQTT-C/master/LICENSE)

Networking and Internet updated at 2024-05-12T05:19:51Z

Lightweight JSON library written in C. [`MIT`](https://raw.githubusercontent.com/atom/atom/master/LICENSE.md)

JSON updated at 2024-05-11T14:17:50Z

Parser combinator library. [`FreeBSD`](https://directory.fsf.org/wiki?title=License:FreeBSD)

Parsers updated at 2024-05-11T10:55:52Z

Tiny recursive-descent parser, compiler and evaluation engine for simple mathematical expressions. [`zlib`](https://directory.fsf.org/wiki/License:Zlib)

Utilities updated at 2024-05-09T22:59:10Z

Improved JPEG encoder. [`3-clause BSD`](https://directory.fsf.org/wiki/License:BSD-3-Clause)

Graphics updated at 2024-05-07T20:47:59Z

Implementation of the [MessagePack](https://msgpack.org/) serialization protocol. [`Expat`](https://directory.fsf.org/wiki/License:Expat)

Serialization updated at 2024-05-03T12:17:52Z

Universal configuration library parser. [`FreeBSD`](https://directory.fsf.org/wiki?title=License:FreeBSD)

Parsers updated at 2024-04-25T14:25:50Z

C implementation of exceptions. [`Expat`](https://directory.fsf.org/wiki/License:Expat)

Utilities updated at 2024-04-13T17:37:31Z

Library for building simple and elegant cross-platform mmo client-server solutions. [`Apache 2.0`](https://directory.fsf.org/wiki/License:Apache-2.0)

Networking and Internet updated at 2024-04-08T07:15:28Z

Template system, with C templates for common code snippets. [`GNU GPL3 or later`](http://www.gnu.org/licenses/gpl-3.0.html)

Emacs updated at 2024-04-06T13:14:51Z

Binary serialization format meant to be compact, fast and easy-to-use. [`Apache 2.0`](https://directory.fsf.org/wiki/License:Apache-2.0)

Serialization updated at 2024-02-22T02:30:50Z

C-based implementation of ZeroMQ. [`Expat`](https://directory.fsf.org/wiki/License:Expat)

Networking and Internet updated at 2024-02-03T22:54:20Z

Single header utf8 string functions. [`Unlicense`](https://unlicense.org/)

String Manipulation updated at 2024-02-02T18:31:23Z

C implementation of the CommonMark spec. [`Various Licenses`](https://github.com/commonmark/commonmark-spec/blob/master/LICENSE)

Utilities updated at 2024-01-28T19:24:34Z

Header only, macro generated, generic and type-safe Collections in C. [`MIT`](https://spdx.org/licenses/MIT.html)

Frameworks updated at 2023-12-14T00:59:59Z

The Quake2 engine. [`GNU GPL2.1`](http://www.gnu.org/licenses/old-licenses/gpl-2.0.html)

Engines updated at 2023-12-05T19:48:59Z

Compile and execute C "scripts" in one go on the command line. Also has shebang support. [`Expat`](https://directory.fsf.org/wiki/License:Expat)

Tools updated at 2023-11-28T14:24:24Z

Minimal unit testing framework for C. [`Expat`](https://directory.fsf.org/wiki/License:Expat)

Testing updated at 2023-10-27T06:25:41Z

Lint C code in Atom, using Clang. [`MIT`](https://raw.githubusercontent.com/atom/atom/master/LICENSE.md)

Atom updated at 2023-07-28T19:10:11Z

Implementation of the Cap'n Proto serialization protocol. [`Expat`](https://directory.fsf.org/wiki/License:Expat)

Serialization updated at 2023-04-23T12:35:37Z

Another implementation of the [MessagePack](https://msgpack.org/) serialization protocol. [`Expat`](https://directory.fsf.org/wiki/License:Expat)

Serialization updated at 2023-04-18T22:08:06Z

HTML5 parsing library in C99. [`Apache 2.0`](https://directory.fsf.org/wiki/License:Apache-2.0)

Networking and Internet updated at 2023-02-15T22:54:12Z

Protocol buffers library. [`Expat`](https://directory.fsf.org/wiki/License:Expat)

Utilities updated at 2022-11-03T03:00:02Z

Multi platform CRC library. [`MIT`](https://raw.githubusercontent.com/atom/atom/master/LICENSE.md)

Hashing updated at 2022-07-31T15:10:42Z

Yet another INI parser. [`GNU GPL3 or later`](http://www.gnu.org/licenses/gpl-3.0.html)

Parsers updated at 2022-07-21T04:16:03Z

Syntax checking and linting. [`Do What The Fuck You Want To license`](https://github.com/vim-syntastic/syntastic/blob/master/LICENCE)

Vim updated at 2022-07-10T12:58:50Z

HTTP request/response parser. [`Expat`](https://directory.fsf.org/wiki/License:Expat)

Networking and Internet updated at 2022-06-19T08:11:39Z

Run C files using hash-bang. [`FreeBSD`](https://directory.fsf.org/wiki?title=License:FreeBSD)

Tools updated at 2022-05-23T00:52:31Z

Fast Positive Hash library. [`zlib`](https://directory.fsf.org/wiki/License:Zlib)

Hashing updated at 2022-03-07T21:03:38Z

Lint C code in Atom, using GCC. [`MIT`](https://raw.githubusercontent.com/atom/atom/master/LICENSE.md)

Atom updated at 2022-02-12T21:30:52Z

Lightweight library of C functions and structures. [`GNU GPL2.1`](http://www.gnu.org/licenses/old-licenses/gpl-2.0.html)

Frameworks updated at 2021-11-20T02:02:46Z

Non-backtracking NFA/DFA-based Perl-compatible regex engine library. [`3-clause BSD`](https://opensource.org/licenses/BSD-3-Clause)

Regex updated at 2021-11-01T05:04:16Z

Library for unit testing with memory leak detection (Linux, freeBSD and Windows). [`GPL2`](http://www.gnu.org/licenses/old-licenses/gpl-2.0.html)

Testing updated at 2021-10-08T01:10:26Z

Simple library for working with KD-trees. [`3-clause BSD`](https://directory.fsf.org/wiki/License:BSD-3-Clause)

Utilities updated at 2021-08-07T15:57:28Z

Tiny library of image utilities dealing with height maps, normal maps, distance fields and the like. [`Expat`](https://directory.fsf.org/wiki/License:Expat)

Graphics updated at 2021-04-27T22:43:51Z

Linux packet crafting tool. [`GPL2`](http://www.gnu.org/licenses/old-licenses/gpl-2.0.html)

Networking and Internet updated at 2020-11-02T16:00:02Z

Super Light Regular Expression library; a very small implementation of a subset of Perl regex syntax. [`GNU GPL2.1`](http://www.gnu.org/licenses/old-licenses/gpl-2.0.html)

Regex updated at 2020-10-26T15:25:50Z

BSON utility library. [`Apache 2.0`](https://directory.fsf.org/wiki/License:Apache-2.0)

Utilities updated at 2020-10-10T09:38:11Z

Netstring encoder and decoder. [`Public Domain`](https://creativecommons.org/share-your-work/public-domain/)

Serialization updated at 2020-10-08T16:17:59Z

Parser combinators for binary formats. [`GNU GPL2.1`](http://www.gnu.org/licenses/old-licenses/gpl-2.0.html)

Parsers updated at 2020-10-06T11:01:23Z

Mini C library for interacting with the Twitter OAuth API. [`Expat`](https://directory.fsf.org/wiki/License:Expat)

Networking and Internet updated at 2020-10-06T10:52:29Z

Asynchronous networking library. [`MIT`](https://raw.githubusercontent.com/atom/atom/master/LICENSE.md)

Networking and Internet updated at 2020-10-06T10:51:15Z

Fast hashtable implementation. [`Apache 2.0`](https://directory.fsf.org/wiki/License:Apache-2.0)

Hashing updated at 2020-09-30T01:34:54Z

Single-header ANSI C gui library. [`Public Domain`](https://creativecommons.org/share-your-work/public-domain/)

Graphical User Interface updated at 2020-01-03T21:36:41Z

Efficient string compression library. [`3-clause BSD`](https://directory.fsf.org/wiki/License:BSD-3-Clause)

String Manipulation updated at 2019-10-25T15:29:28Z

Deprecated, here for archival purposes. Eventing framework for building high-scalability and high-performance systems. [`Apache 2.0`](https://directory.fsf.org/wiki/License:Apache-2.0)

Utilities updated at 2019-03-08T18:48:08Z

Small, low overhead, structured logging library intended for logging formware events.[`Apache 2.0`](https://directory.fsf.org/wiki/License:Apache-2.0)

Utilities updated at 2017-11-17T22:31:47Z

Simple and complete implementation of regular expressions with its own sintax. [`GNU GPL3 or later`](http://www.gnu.org/licenses/gpl-3.0.html)

Regex updated at 2017-10-17T03:30:22Z

ELF object file access library in C. [`GNU GPL2.1`](http://www.gnu.org/licenses/old-licenses/gpl-2.0.html)

Utilities updated at 2017-06-05T10:50:18Z

C99 wrapper for the BSD sockets API. [`ISC`](https://directory.fsf.org/wiki/License:ISC)

Networking and Internet updated at 2017-05-04T17:47:07Z

Minimal Huffman encoder and decoder. [`Public Domain`](https://creativecommons.org/share-your-work/public-domain/)

Utilities updated at 2013-06-14T18:40:40Z