The best FreeRTOS alternatives
The rest of Best IoT Operating Systems, in this site's order: each with what it costs, where it runs and its record score.
OpenWrt suits users who want to customize embedded devices, particularly wireless routers, and are familiar with GNU/Linux and basic networking.
NuttX suits developers building software for embedded boards and devices across its supported processor architectures.
Contiki-NG suits developers building low-power IoT devices with constrained memory and standard network protocols.
Mynewt is for developers building embedded applications for supported microcontrollers.
PX5 RTOS suits developers of resource-constrained embedded systems, particularly in safety-critical automotive, industrial, medical or rail settings.
It suits teams building embedded products that need real-time behavior, fault recovery, POSIX portability, and defined processor support.
It suits organizations assessing edge software against supported device operating systems, protocols, and over-the-air update requirements.
It suits connected-device deployments using the MT3620AN that need an operating system, Azure Sphere Security Service access, and ongoing OS updates.