H2O - the optimized HTTP/1, HTTP/2, HTTP/3 server

Higher level programming in C

πfs - the data-free filesystem!

The seL4 microkernel

OSv, a new operating system for the cloud.

Low-level unprivileged sandboxing tool used by Flatpak and similar projects

A small self-contained alternative to readline and libedit

Experimental PlayStation 4 emulator.

UNIX-like reverse engineering framework and command-line toolset.

A Tiny Linux-Compatible Kernel

A lightweight JIT compiler based on MIR (Medium Internal Representation) and C11 JIT compiler and interpreter based on MIR

Embedded JavaScript engine for C/C++

SGDK - A free and open development kit for the Sega Mega Drive

Open-source implementation of the K programming language

A searchable, syncable, content-addressable notetaking system

WASI libc implementation for WebAssembly

Test suite to help you write your own C compiler

ninja-compatible build tool written in C

C11 compiler (mirror)

Modest is a fast HTML renderer implemented as a pure C99 library with no outside dependencies.

Virtual Machine for Intermediate Representation

Developed at Lawrence Livermore National Laboratory (LLNL), ROSE is an open source compiler infrastructure to build source-to-source program transformation and analysis tools for large-scale C (C89…

libc targeted for embedded systems usage. Reduced set of functionality (due to embedded nature). Chosen for portability and quick bringup.

CloudABI's standard C library

The Public Domain C Library

A tool for converting C and Objective-C headers to D modules

The InitWare Suite of Middleware allows you to manage services and system resources as logical entities called units. Its main component is a service management ("init") system.

Custom Arduino C++ firmware for the P8 and PineTime plus many more DaFit Smartwatches

Redislite is a software library that implements a self-contained, serverless, zero-configuration, redis-compatible database engine.

A public domain implementation of the C11 standard library.