An operating system based on the best Windows NT design principles
Building and running ancient Linux on Windows
Free operating system for Atari computers, and more.
Software development for 4Mb portable, using Z80 CPU and AA batteries
Alternative operating system for x86 computers
A cute and educational x86 OS
AO RTOS is small real time OS based on Active Object concurrency model
C-BIOS is an open source BIOS for MSX computers.
A microkernel-based multiserver operating system written from scratch.
Indipendent distro uses inary package system. Sulin is roolling donkey
OS bootable from Linux,Windows and others partitions as auxiliary OS
RTOS for Secure, Safe and Real-Time Systems
Real-Time Embedded Operating System
An operating system written in RTL
A Debug style tool for OS Free systems
Mulithreading Arduno library
An operating system for tenputer
Run Linux on Windows or other OSes, natively.