Benchmark Code from K Computing: http://www.kcomputing.com/benchmark/
Benno Senoner's Web Site for Latency Tools: http://www.linuxdj.com/
DIAPM RTAI: http://www.aero.polimi.it/projects/rtai/
Robert Love Patch: ftp://ftp.kernel.org/pub/linux/kernel/people/rml/preempt-kernel/
RTLinux: ftp://ftp.rtlinux.org/
TimeSys: http://www.timesys.com/