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What is RTEMS
Real-Time Executive for Multiprocessor Systems (RTEMS) is an open source fully featured Real Time Operating System (RTOS) that supports a variety of open standard application programming interfaces (API) and interface standards such as POSIX and BSD sockets. It is used in space flight, medical devices, networking and many more embedded systems across a wide range of processor architectures including ARM, PowerPC, Intel, Blackfin, MIPS, Microblaze and more.
RTEMS is free software; you can redistribute it and/or modify it under terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. RTEMS is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with RTEMS; see file COPYING. If not, write to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
As a special exception, including RTEMS header files in a file, instantiating RTEMS generics or templates, or linking other files with RTEMS objects to produce an executable application, does not by itself cause the resulting executable application to be covered by the GNU General Public License. This exception does not however invalidate any other reasons why the executable file might be covered by the GNU Public License.
Other modules of licenses govern their respective packages including but not limited to TCP/IP Stack License, RPC/XDR License, GoAhead Webserver License (requires graphic to be displayed on website hosted), and the Stanford University Permissive License
Open Source Community
For more information about RTEMS and its Open Community please see the RTEMS Community site