C99

glfwglfw/glfw

A multi-platform library for OpenGL, OpenGL ES, and Vulkan development, providing window creation, input handling, and context management.

FlecsSanderMertens/flecs

A fast and lightweight Entity Component System (ECS) for building games and simulations with millions of entities in C and C++.

JerryScriptjerryscript-project/jerryscript

An ultra-lightweight JavaScript engine designed to run on microcontrollers and IoT devices with less than 64KB RAM.

ForgeConfettiFX/The-Forge

A cross-platform graphics framework for building and extending game engines across PC, mobile, and consoles.

gumbo-parsergoogle/gumbo-parser

A pure-C HTML5 parsing library implementing the HTML5 parsing algorithm.

Tiny AES in Ckokke/tiny-AES-c

A small, portable C implementation of AES encryption supporting ECB, CBC, and CTR modes with minimal memory footprint.

s2nawslabs/s2n

A C99 TLS/SSL implementation designed for simplicity, small size, speed, and security-first design.

goxelguillaumechereau/goxel

A free and open-source 3D voxel editor for creating graphics from cubes, available on desktop and mobile platforms.

ckconcurrencykit/ck

A C99+ library providing concurrency primitives, safe memory reclamation mechanisms, and non-blocking data structures for high-performance concurrent systems.

cpu_featuresgoogle/cpu_features

A cross-platform C99 library to detect CPU features and microarchitecture at runtime.

Chipmunk Physicsslembcke/Chipmunk-Physics

A fast, lightweight 2D rigid body physics library written in C, designed specifically for video games.

Chipmunkslembcke/Chipmunk2D

A fast, lightweight 2D rigid body physics library written in C, designed specifically for video games.

facil.ioboazsegev/facil.io

A high-performance C micro-framework for building event-driven web applications and network services.

Genanncodeplea/genann

A minimal, well-tested library for training and using feedforward artificial neural networks in ANSI C.

libavifAOMediaCodec/libavif

A portable C library for encoding and decoding AV1 Image File Format (.avif) images with support for all AV1 YUV formats and alpha.

cmarkcommonmark/cmark

A C reference implementation of CommonMark for parsing and rendering Markdown documents to multiple formats.

cgltfjkuhlmann/cgltf

A single-file C99 library for loading and writing glTF 2.0 assets, used by major graphics engines.

Tinyexprcodeplea/tinyexpr

A minimal C library for parsing, compiling, and evaluating mathematical expressions at runtime with no dependencies.

RGFWColleagueRiley/RGFW

A cross-platform, single-header C windowing library for creating windows and graphics contexts with minimal dependencies.

librglibrg/librg

A lightweight C99 single-header library for efficient world replication and entity synchronization in multiplayer games.

librgzpl-c/librg

A lightweight C99 library for efficient world replication and entity synchronization in multiplayer games.

GunslingerMrFrenik/gunslinger

A header-only C99 framework for building cross-platform games and multimedia applications with a simple API.

Tilenginemegamarc/Tilengine

A free, cross-platform 2D graphics engine for creating classic/retro games with tile maps, sprites, and raster effects.

Hoedownhoedown/hoedown

A standards-compliant, fast, and secure C library for parsing and rendering Markdown to HTML.

libhydrogenjedisct1/libhydrogen

A lightweight, secure, easy-to-use cryptographic library for constrained environments like microcontrollers.

libonnxxboot/libonnx

A lightweight, portable pure C99 ONNX inference engine for embedded devices with hardware acceleration support.

reprocDaanDeMeyer/reproc

A cross-platform C/C++ library for starting, stopping, and communicating with external programs via their standard streams.

ConcordCogmasters/concord

A lightweight, asynchronous C99 Discord API wrapper library with minimal dependencies.

libschrifttomolt/libschrift

A lightweight, dependency-free TrueType font rendering library written in C99.

librecreytiv/re

A portable C library providing SIP, RTP, STUN/TURN/ICE, HTTP, and WebSocket stacks for building real-time communication applications.

yashmagicant/yash

A POSIX-compliant command line shell with advanced interactive features like global aliases, arrays, and intelligent command line completion.

mini-xmlmichaelrsweet/mxml

A lightweight C library for parsing and manipulating XML data with minimal dependencies.

hemanprideout/heman

A tiny C library for heightmap, normal map, and distance field generation with no dependencies.

okshibara/oksh

A portable, self-contained implementation of the OpenBSD Korn Shell (ksh) that runs across many operating systems and compilers.

streamvbytelemire/streamvbyte

A fast C library for integer compression using SIMD-accelerated StreamVByte codec.

uriparseruriparser/uriparser

A strictly RFC 3986 compliant URI parsing and handling library written in C99.