An open source OS written in assembly.
A small operating system, compatible with MS-DOS, written in assemly
Embedded Real-Time Operating System (RTOS)
A new OS
Custom firmware and IDE for the VEX Cortex Microcontroller
a very fast full system simulator
Simple, Fast, Advanced... ZintoriOS. Made in Wellington, New Zealand
Crosos is a SubLinux Distribution
Project has been move to https://github.com/ciaa/Firmware
Yet another Kernel - clone the git repo for newest version
Hard Real-Time OS compliant to the Osek/Vdx standard.
NuzulOS - pascal operating system
DroidLDR is a MultiBoot loader for every Droid Phone
Mayax is a 32-bit hobby OS with windows style GUI.
Operating System in 512bytes.