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This project is now in the research and development stage. It is intended for very small microcontrollers with a single processor and represent simple multithreading kernel what written by C language. Is planning create implementations for AVR8 and STM8, may be. Now it is suspended until better time.
Contiki is an open source, highly portable, networked, multi-tasking operating system for memory-constrained systems.
Contiki current source code: https://github.com/contiki-os/contiki
Contiki historical source code: https://github.com/adamdunkels/contiki-1.x
Jari OS is a real-time microkernel operating system which runs in terms of multi-service architecture. Core system consists of its own microkernel μString, core and system services, set of device drivers launched as trusted services.
A new kernel I am developing in my spare time. The eventual solution I hope will involve a 32 bit base kernel and 64 bit extensions therefore maximising compatibility with non 64 bit machines. Database oriented. Checkout http://www.love2code.org
UPDATE 18-Dec-2011
Updates haven't occurred for some time (April) due to working and studying for my Computer Science degree at the University of Ulster, but it's Christmas! so may be we'll get a little closer to doing some more work.
I have...
TempOS is an Educational and multi purpose Operating System. TempOS was born as an undergraduate work and has it's your main goal to be not only another Operating System, but a complete toolkit designed to help students on their O.S. courses.
OpenCom is an open-source component programming model designed by the School of Computing and Communications at Lancaster University, UK. This project maintains the official C language version of OpenCom.
Operating System Framework for a MIPS Simulator.
The project includes a multi-threaded MIPS Simulator and a naive Operating System and an Assembler for the simulated architecture, intended to be used for instructional and educational purpose.
Minirighi is a multi-threading open-source operating system written for didactic purpose. It has been written from scratch and it is compatible with POSIX.