Linux kernel source tree

How to Make a Computer Operating System in C++

A free Windows-compatible Operating System

Learning operating system development using Linux kernel and Raspberry Pi

Simple and portable (but not inflexible) GUI library in C that uses the native GUI technologies of each platform it supports.

A Compiler Writing Journey

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

Original Windows File Manager (winfile) with enhancements

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…

'Classic' FreeRTOS distribution. Started as Git clone of FreeRTOS SourceForge SVN repo. Submodules the kernel.

A cross-platform library to access USB devices

Decompilation of The Legend of Zelda: Ocarina of Time

Tutorial: Writing a "bare metal" operating system for Raspberry Pi 4

In application debugger for ARM Cortex microcontrollers.

The Boehm-Demers-Weiser conservative C/C++ Garbage Collector (bdwgc, also known as bdw-gc, boehm-gc, libgc)

Quake 2 GPL Source Release

Firmware for Pinetime smartwatch written in C++ and based on FreeRTOS

Bare metal Raspberry Pi 3 tutorials

Hardware backdoors in some x86 CPUs

Simple C compiler

Fork of the Xash3D FWGS with a real-time path tracing

Build a minimal multi-tasking OS kernel for ARM from scratch

Software drivers in C for systems without an operating system

Homebrew PS2 SDK

Classic overhead run-and-gun game

Audio Editor

Free exFAT file system implementation

Cycle-Accurate Nintendo 64 Emulator

Various kernel exploits

opuntiaOS - an operating system targeting x86, ARM and RISC-V.