Linux kernel source tree

stb single-file public domain libraries for C/C++

A simple and easy-to-use library to enjoy videogames programming

How to Make a Computer Operating System in C++

A maintained, feature-rich and performance oriented, neofetch like system information tool.

A free Windows-compatible Operating System

High performance UI layout library in C.

The systemd System and Service Manager

Simple DirectMedia Layer

Kernel source tree for Raspberry Pi-provided kernel builds. Issues unrelated to the linux kernel should be posted on the community forum at https://forums.raspberrypi.com/

mimalloc is a compact general purpose allocator with excellent performance.

A simple Minecraft clone written in C using modern OpenGL (shaders).

A small C compiler

A single-header ANSI C immediate mode cross-platform GUI library

C in four functions

The single instruction C compiler

minimal cross-platform standalone C headers

xv6 OS

Xv6 for RISC-V

Unicorn CPU emulator framework (ARM, AArch64, M68K, Mips, Sparc, PowerPC, RiscV, S390x, TriCore, X86)

Open Source Soldering Iron firmware

The “Quite OK Image Format” for fast, lossless image compression

WinBtrfs - an open-source btrfs driver for Windows

A completely-from-scratch hobby operating system: bootloader, kernel, drivers, C library, and userspace including a composited graphical UI, dynamic linker, syntax-highlighting text editor, network…

An open-source OS project that aims to provide source and binary compatibility with macOS® and a similar user experience.

A tiny immediate-mode UI library

Package manager for the C programming language.

Bootloader for macOS, Windows and Linux in UEFI and in legacy mode

"Das U-Boot" Source Tree

Compiler for the C3 language