Building and running ancient Linux on Windows
AO RTOS is small real time OS based on Active Object concurrency model
Alternative operating system for x86 computers
RTOS for Secure, Safe and Real-Time Systems
Real-Time Embedded Operating System
A UNIX-like kernel for the i386 architecture
Mulithreading Arduno library
A small operating system, compatible with MS-DOS, written in assemly
Embedded Real-Time Operating System (RTOS)
Operating System in 512bytes.
MinopsOS is a tiny operating system for PC computers.