RTOS
FreeRTOS
eProsima: RTPS/DDS Experts, the middleware experts
BriscoeTech/Arduino-FreeRTOS-SAMD51: A port of FreeRTOS that runs on Arduino Samd51 boards
Rybec/pyRTOS: RTOS written in pure Python, designed for use with CircuitPython
micro-ROS/freertos_apps: Sample applications for FreeRTOS + micro-ROS
Seeed Studio Github