An operating system based on the best Windows NT design principles
Free operating system for Atari computers, and more.
Software development for 4Mb portable, using Z80 CPU and AA batteries
A tapas/topaz/sapphire kernel optimized for smoothness and low-memory
An ADL-mode rewrite of the ez80 CP/M 3.1 port
AO RTOS is small real time OS based on Active Object concurrency model
Building and running ancient Linux on Windows
Alternative operating system for x86 computers
A cute and educational x86 OS
A microkernel-based multiserver operating system written from scratch.
C-BIOS is an open source BIOS for MSX computers.
Indipendent distro uses inary package system. Sulin is roolling donkey
Tiny Kernel is a work in progress Operating System kernel.
Simplest kernel for cooperative multithreading
An little operating system
OS bootable from Linux,Windows and others partitions as auxiliary OS
Message passing microkernel-based Operating System for ZX Spectrum +3e
UNIX/LINUX and legal homebrew software on the xbox360 gaming console