* '''[https://en.wikipedia.org/wiki/VxWorks VxWorks (used in PROBA-1)]:''' VxWorks is a multi-thread and real-time operating system. VXworks is the world leader of the optimization of software for peripherals.

* '''[https://en.wikipedia.org/wiki/FreeRTOS FreeRTOS (used in ESTCube-1)]:''' FreeRTOS is a popular real-time operating system kernel which has small memory footprint, low overhead and fast execution.

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