The Reliable USB Formatting Utility

A free Windows-compatible Operating System

SumatraPDF reader

Learning operating system development using Linux kernel and Raspberry Pi

A Compiler Writing Journey

C in four functions

A tiling window manager for X11

Writing a sqlite clone from scratch in C

The single instruction C compiler

Quake III Arena GPL Source Release

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…

Redshift adjusts the color temperature of your screen according to your surroundings. This may help your eyes hurt less if you are working in front of the screen at night.

The seL4 microkernel

Open source STM32 MCU programming toolset

HTTrack Website Copier, copy websites to your computer (Official repository)

Bare metal Raspberry Pi 3 tutorials

Audio and video casting system with support for custom applications.

Hardware backdoors in some x86 CPUs

Chocolate Doom is a Doom source port that is minimalist and historically accurate.

A C++ bare metal environment for Raspberry Pi with USB (32 and 64 bit)

Keen Dreams on Greenlight!

The tiniest window manager.

A portable microkernel-based multiserver operating system written from scratch.

System Shock (PowerMac version / Official GPL Release)

A Pluggable Authentication Module (PAM) which allows the establishment of alternate passwords that can be used to perform actions to clear sensitive data, notify IT/Security staff, close off sensit…

The Rumprun unikernel and toolchain for various platforms

rusefi - GPL internal combustion engine control unit

A Simple Unix-like operating system

The Yamagi Quake II client

Shockolate - A minimalist and cross platform System Shock source port.