1 * '''DevLib''' - Homebrew library for embedded development that includes a small multitasking kernel.
2 * '''uClinux''' - A Linux kernel and distribution targeting several MMU-less microcontrollers.
3 * '''Nut/OS''' - Nice OpenSource RTOS for 8/16/32bit systems. See http://www.ethernut.de/en/software.html .
4 * '''FreeRTOS''' - Yet another OpenSource RTOS. See http://www.freertos.org/ .
5 * '''QNX''' - A microkernel RTOS with a wonderful system architecture.
6 * '''AmigaOS''' - Almost an embedded OS, and definitely an RTOS.