An operating system based on the best Windows NT design principles
Hobby operating system, bootloader, kernel, drivers, C library
freeRTOS for Arduino Uno, Goldilocks 1284p & Mega 2560
The classic RPL programming language reimplemented and reimagined.
Indipendent distro uses inary package system. Sulin is roolling donkey
https://github.com/libcgroup/libcgroup
Simplest kernel for cooperative multithreading
UNIX/LINUX and legal homebrew software on the xbox360 gaming console
Open-source RTOS and Embedded Systems Toolkit for C++ and C
Hanthana Linux Project
Linux Kernel Input/Output Driver for one single GPIO line
ext2/3/4 library for microcontrollers
A UNIX-like kernel for the i386 architecture
Mulithreading Arduno library
W-Bus communication library
FreeMiNT is a free alternative OS kernel for Atari systems & clones
64-BIt Operating System with Compiler