The RTEMS Project provides support for 3 branches, the devel branch, sometimes referred to as main, the current release and a previous release. Older releases are available and bug reports are welcome however the RTEMS Project may not respond to those reports.
The current release of RTEMS is 5.3
| Download | https://ftp.rtems.org/pub/rtems/releases/5/5.3/ |
| Development Branch | https://gitlab.rtems.org/rtems/rtos/rtems/-/tree/5 |