Building and running ancient Linux on Windows
amforth is an extendible interpreter on microcontrollers
AO RTOS is small real time OS based on Active Object concurrency model
Software development for 4Mb portable, using Z80 CPU and AA batteries
Alternative operating system for x86 computers
C-BIOS is an open source BIOS for MSX computers.
OS bootable from Linux,Windows and others partitions as auxiliary OS
Written in pure ASM and Exode with cloud computing in mind.
Neptune is a kernel and operating system for x86 PCs.
A small operating system, compatible with MS-DOS, written in assemly
Custom firmware and IDE for the VEX Cortex Microcontroller
a very fast full system simulator
Hard Real-Time OS compliant to the Osek/Vdx standard.
Mayax is a 32-bit hobby OS with windows style GUI.