Real-Time Event Frameworks based on active objects & state machines
GobLin: The GNU/Linux Operating System for Governments
Thread Scheduler with custom asynchronous messaging in VC++
humbly smart Operating System - Debian derivative
An little operating system
LuninuxOS is a Debian/Ubuntu based Linux distribution.
Open-source RTOS and Embedded Systems Toolkit for C++ and C
Hanthana Linux Project
Android, DOS, FirefoxOS, Linux, MacOS and Windows all in one..
Universal Operating System
(download) Linux Adequate"available approximately five days"
Ubuntu Power: All-In-One Ubuntu version