Rtems (Real-Time Executive for Multiprocessor Systems) is a free open source real-time operating system designed for embedded systems.
The acronym Rtems initially stood for Real-Time Executive for Missile Systems, then became Real-Time Executive for Military Systems before changing to its current meaning. Rtems development began in the late 1980s with early versions of Rtems available via ftp as early as 1993. OAR Corporation is currently managing the Rtems project in cooperation with a Steering Committee which includes user representatives.
