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 small C compiler

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

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

C in four functions

The single instruction C compiler

minimal cross-platform standalone C headers

Xv6 for RISC-V

xv6 OS

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

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

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…

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