An operating system based on the best Windows NT design principles
AO RTOS is small real time OS based on Active Object concurrency model
Software development for 4Mb portable, using Z80 CPU and AA batteries
C-BIOS is an open source BIOS for MSX computers.
OS-9/6809 compatible operating system for Tandy CoCo and Dragon
Message passing microkernel-based Operating System for ZX Spectrum +3e
Real-Time Embedded Operating System
FreeDOS is an open source DOS-compatible operating system
FreeMiNT is a free alternative OS kernel for Atari systems & clones
A multiplatform, DOS-like operating system
This will be an operating system
CMAKE build enviroment for LPC2000 and LPC17xx Cortex MCUs
Embedded Operating System
Custom firmware and IDE for the VEX Cortex Microcontroller
Project has been move to https://github.com/ciaa/Firmware
Nanux Kernel