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Top 23 C C99 Projects
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AppSignal
AppSignal knows why the f*#k it crashed. Stop vibe-debugging. Every exception, every backtrace, grouped so you see patterns, not noise.
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kimi-k3-in-c
A 2.78-trillion-parameter Kimi K3 running inference on a single CPU in 8.24 GB of RAM. Portable C99: no BLAS, no framework, no GPU.
Project mention: How a 176 KB C Binary Runs a 2.78-Trillion-Parameter Model on One CPU with 8 GB of RAM | dev.to | 2026-08-05 -
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Project mention: BarraCUDA Open-source CUDA compiler targeting AMD GPUs | news.ycombinator.com | 2026-02-17
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Kargo
Stop Scripting Promotions. Start Shipping with Kargo. Kargo automates promotion across dev, staging, and prod with approval gates and verification. Open source, built by the team behind Argo CD. Download now.
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Melon
A generic cross-platform C library that includes many commonly used components and frameworks, and a new scripting language interpreter. It currently supports C99 and Aspect-Oriented Programming (AOP).
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libexpat
:herb: Fast streaming XML parser written in C99 with >90% test coverage; moved from SourceForge to GitHub
Project mention: Curl will not accept vulnerability reports during July 2026 | news.ycombinator.com | 2026-06-14Both libexpat ("Expat") and uriparser are following the curl security vacation and will not accept new vulnerability reports before 2026-08-01, starting today.
[1] https://github.com/libexpat/libexpat/issues/1277
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libtcod
A collection of tools and algorithms for developing traditional roguelikes. Such as field-of-view, pathfinding, and a tile-based terminal emulator.
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Project mention: Recursive macros in C, demystified (once the ugly crying stops) | news.ycombinator.com | 2025-11-05
The CPP does allow quite advanced metaprogramming, it's just so obtuse to use and requires insane hacks so almost nobody does. See one of my favorite projects https://github.com/hirrolot/metalang99
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Cloak
A mini-preprocessor library to demostrate the recursive capabilites of the preprocessor (by pfultz2)
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wax
A tiny programming language that transpiles to C, C++, Java, TypeScript, Python, C#, Swift, Lua and WebAssembly 🚀
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
C C99 discussion
C C99 related posts
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How a 176 KB C Binary Runs a 2.78-Trillion-Parameter Model on One CPU with 8 GB of RAM
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Kimi K3 2.78T on One CPU with 8GB RAM
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Curl will not accept vulnerability reports during July 2026
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Libfirm/cparser: C99 parser and front end
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Show HN: I wrote an embeddable Unicode algorithms library in C
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How SQLite Is Tested
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Giving C a Superpower
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A note from our sponsor - AppSignal
www.appsignal.com | 11 Sep 2026
Index
What are some of the best open-source C99 projects in C? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | flecs | 8,643 |
| 2 | kimi-k3-in-c | 7,206 |
| 3 | s2n | 4,761 |
| 4 | cgltf | 1,983 |
| 5 | RGFW | 1,875 |
| 6 | Booth | 1,738 |
| 7 | datatype99 | 1,498 |
| 8 | Melon | 1,459 |
| 9 | gunslinger | 1,416 |
| 10 | libexpat | 1,373 |
| 11 | libtcod | 1,223 |
| 12 | metalang99 | 1,084 |
| 13 | Cloak | 986 |
| 14 | wax | 855 |
| 15 | libspng | 836 |
| 16 | garlic | 812 |
| 17 | exengine | 786 |
| 18 | halfix | 779 |
| 19 | json-parser | 704 |
| 20 | voxelizer | 663 |
| 21 | azure-iot-sdk-c | 620 |
| 22 | nbnet | 565 |
| 23 | FastLZ | 543 |
Sponsored
AppSignal knows why the f*#k it crashed.
Stop vibe-debugging. Every exception, every backtrace, grouped so you see patterns, not noise.
www.appsignal.com