AO RTOS is small real time OS based on Active Object concurrency model
Building and running ancient Linux on Windows
Software development for 4Mb portable, using Z80 CPU and AA batteries
Alternative operating system for x86 computers
A cute and educational x86 OS
C-BIOS is an open source BIOS for MSX computers.
OS-9/6809 compatible operating system for Tandy CoCo and Dragon
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
A UNIX-like kernel for the i386 architecture
Mulithreading Arduno library
FreeMiNT is a free alternative OS kernel for Atari systems & clones
Run Linux on the Playstation 2
Written in pure ASM and Exode with cloud computing in mind.
Run Linux on Windows or other OSes, natively.
An indie, hobby operating system