RTEMS
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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 taking its current signification.
It has been ported to various target processors (ARM, i386, m68k, MIPS, PowerPC, SH, etc). RTEMS is designed to support various open API like POSIX and uITRON. FreeBSD TCP/IP stack and various filesystem are also supported. OAR Corporation is currently managing the RTEMS project. RTEMS is used by some EPICS sites.
RTEMS is distributed under a modified GPL licence, allowing to link RTEMS objects with other files without requiering the entire executable to be covered by the GPL. This is somewhat like the LGPL.
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