AO RTOS is small real time OS based on Active Object concurrency model
A microkernel-based multiserver operating system written from scratch.
RTOS for Secure, Safe and Real-Time Systems
An operating system written in RTL
A UNIX-like kernel for the i386 architecture
Reductively Architected Breviloquently Built Information Environment
Written in pure ASM and Exode with cloud computing in mind.
Neptune is a kernel and operating system for x86 PCs.
An open source OS written in assembly.
Embedded Real-Time Operating System (RTOS)
A new OS
Custom firmware and IDE for the VEX Cortex Microcontroller
Simple, Fast, Advanced... ZintoriOS. Made in Wellington, New Zealand
Crosos is a SubLinux Distribution
Project has been move to https://github.com/ciaa/Firmware
DroidLDR is a MultiBoot loader for every Droid Phone
A rethinking of the Operating System Ecosystem.