WDF makes it easy to write high-quality Windows drivers

Computing with traps

The Interim Operating System

A Firmware-Only USB implementation for Atmel's AVR Microcontrollers

EsoLangVM Compiler Infrastructure

The C Code Archive Network

Open Watcom V2.0 - Source code repository, Wiki, Latest Binary build, Archived builds including all installers for download.

A sandboxed execution environment for unikernels

NES emulator in <5000 bytes of C

DEPRECATED - DO NOT USE | Go here instead ->

Mirror only see https://gitlab.rtems.org/rtems/rtos/rtems

Xvisor: eXtensible Versatile hypervISOR

Porting the Darwin kernel to the AArch64/ARMv7/ARMv6-A architectures.

A minimal C runtime for Linux i386 & x86_64

progman.exe^H^H^H^H

A minimalist C compiler with x86_64 code generation

fsv is a file system visualizer in cyberspace. It lays out files and directories in three dimensions, geometrically representing the file system hierarchy to allow visual overview and analysis.

ParTcl - a micro Tcl implementation

WebAssembly interpreter in C

Repository for Xinu source code

hvdos, a simple DOS emulator based on the OS X Hypervisor.framework

An open source sort-of CP/M 2.2 distribution.

A Macintosh II emulator that runs A/UX

Non-EOL (yes!) AArch64 UEFI firmware for Lumia 950 / Lumia 950 XL

A bare metal USB driver for Raspberry Pi 1-3 written in C

WIP UEFI EDK2 Implementation for Nintendo Switch or generic Tegra210 platforms

micro read line library for small and embedded devices

Community developed and maintained version of the OS/Net consolidation

A collection of compiler, emulator and microkernel tools.

A shell for Windows Native Mode