NuttX is a mature and secure real-time operating system (RTOS) with an emphasis on technical standards compliance and small size. It is scalable from 8-bit to 64-bit microcontrollers and microproce...

QNX

QNX is a commercial operating system first released in 1980. The operating system is based on a micro-kernel design, with the file system(s), network stack, and various other drivers each running i...