FreeRTOS
Real-time operating system for resource-constrained devicesHow it works
FreeRTOS is an open source, cloud-neutral, real-time operating system that offers a fast, dependable, and responsive kernel. FreeRTOS is freely distributed under the Massachusetts Institute of Technology (MIT) open source license and is implemented in over 40 architectures, providing developers with a broad choice of hardware along with a set of prepackaged software libraries.