Free operating system for Atari computers, and more.
Software development for 4Mb portable, using Z80 CPU and AA batteries
A cute and educational x86 OS
A microkernel-based multiserver operating system written from scratch.
an MS-DOS compatible OS, written in Pascal and i8086 assembly
Tiny Kernel is a work in progress Operating System kernel.
OS bootable from Linux,Windows and others partitions as auxiliary OS
UNIX/LINUX and legal homebrew software on the xbox360 gaming console
RTOS for Secure, Safe and Real-Time Systems
Real time preemptive embedded multi-thread kernel
Real-Time Embedded Operating System
A Debug style tool for OS Free systems
A UNIX-like kernel for the i386 architecture
Mulithreading Arduno library
Run Linux on the Playstation 2
FreeMiNT is a free alternative OS kernel for Atari systems & clones
Run Linux on Windows or other OSes, natively.
Fenix/Free/Fast VDI
Crosos is a SubLinux Distribution