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ChibiOS/RT is a free and efficient RTOS designed for deeply embedded applications. It offers a comprehensive set of kernel primitives and supports many architectures: ARM7, Cortex-M0, Cortex-M3, Cortex-M4, PowerPC e200z, STM8, AVR, MSP430, ColdFire, H8S, x86.
Pharos is a free open-source RTOS for secure, safe and real-time systems with the following characteristics:
- Memory and enhanced time partitioning (TSP)
- Native support for sporadic, periodic and aperiodic threads
- Fixed-priority preemptive scheduler
- Execution time protection (threads are prevented from executing for more time than they are configured to)
- Small size (full image has ~100 to 300KiB text, ~30KiB data)
- Hard real-time determinism
- Fast critical sections
-...
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.