There are a lot of realtime operatings systems out there right now, competing for a spot on the IoT hypetrain: - the mentioned RIOT OS (https://riot-os.org/ ht

There are a lot of realtime operatings systems out there right now, competing for a spot on the IoT hypetrain: - the mentioned RIOT OS (https://riot-os.org/ https://riot-os.org/) - FreeRTOS (https://www.freertos.org/ https://www.freertos.org/) and Amazon's version of it (https://aws.amazon.com/freertos/ https://aws.amazon.com/freertos/) - Zephyr OS (https://www.zephyrproject.org/ https://www.zephyrproject.org/) - MyNewt (https://mynewt.apache.org/ https://mynewt.apache.org/) - Mbed OS (https://os.mbed.com/ https://os.mbed.com/) and more... Makes it really hard to choose one!