... IoT Greengrass. FreeRTOS is built with an emphasis on reliability and ease of use, and offers the predictability of long-term support releases. A microcontroller contains a simple, resource-constrained processor that can be found in many devices, including appliances, sensors, fitness trackers, industrial automation, and automobiles. Many of these small devices can benefit from connecting to the cloud or locally to other devices, but have limited compute power and memory capacity.