RTEMS

Real-Time Executive for Multiprocessor Systems (RTEMS), formerly Real-Time Executive for Missile Systems, and then Real-Time Executive for Military Systems, is a real-time operating system (RTOS) designed for embedded systems. It is free and open-source software.

Development began in the late 1980s with early versions available via FTP as early as 1993. OAR Corporation managed the RTEMS project in cooperation with a steering committee until the early 2000s when project management evolved into a subset of the core developers managing the project. In 2014, hosting was moved from OAR Corporation to the Open Source Lab at Oregon State University.