RTEMS

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RTEMS

Developer	OAR Corporation
Written in	Ada, C
OS family	Real-time operating system
Working state	Current
Source model	Open source
Initial release	1993; 31 years ago (1993)
Latest release	5.3 / February 10, 2023; 20 months ago (2023-02-10)[1]
Repository	git.rtems.org
Marketing target	Embedded systems
Available in	English
Platforms	ARM, Blackfin, ColdFire, TI C3x/C4x, H8/300, x86, 68k, LatticeMico32, MIPS (Mongoose-V), Nios II, OpenRISC, PowerPC, SuperH, SPARC (ERC32, LEON)
Kernel type	Real-time
Default user interface	Command-line
License	Modified GPL
Official website	www.rtems.org

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 File Transfer Protocol (ftp) as early as 1993. OAR Corporation is currently managing the RTEMS project in cooperation with a steering committee which includes user representatives.