Cesium RTOS is a full-featured embedded operating system that was originally forked from Micrium µC/OS. The codebase is strictly developed and maintained by Weston Embedded Solutions. It features support for TCP/IP, USB-Device, USB-Host, and Modbus, as well as a robust file system.

Discover PX5. Professional embedded software developers choose PX5 RTOS, Bill Lamie’s 5th generation RTOS, successor to ThreadX.

Eclipse ThreadX: The First Open Source RTOS Certified for Safety-Critical Applications

Market-leading MIT licensed open source real-time operating system (RTOS) for microcontrollers and microprocessors. Includes IoT and general purpose libraries.