Long-running real-time kernel for microcontrollers, MIT-licensed and acquired by AWS in 2017. Still the most-deployed RTOS in the world by unit count, but the core architecture has evolved little since the early 2000s and the design is starting to feel dated next to newer entrants. While the source is technically open under MIT, governance and direction sit firmly with AWS — it is not neutrally community-governed in the way Zephyr (Linux Foundation), Apache NuttX (Apache Foundation), or RT-Thread are, which limits its appeal for teams that want a vendor-neutral foundation.
Continue using for resource-constrained applications; Consider FreeRTOS-Plus extensions for advanced features
Still the go-to choice for memory-constrained applications under 64KB RAM Moving to Deprecate as the strategic recommendation: the kernel remains solid for existing deployments and small projects, but for new programs in 2026 the integrated ecosystem and neutral governance of Zephyr or NuttX make them better defaults. Existing FreeRTOS-based products do not need urgent migration; this is a forward-looking call.