Advantech: http://www.advantech.com/
CAN Driver: http://www.realtimelinux.org/
CANalyzer: http://www.vector-informatik.de/
DataSocket: http://www.ni.com/
MiniRTL: http://www.rtlinux.org/ and http://www.thinkingnerds.com/
Real Time Devices: http://www.rtdusa.com/
RTLinux: http://www.fsmlabs.com/ and http://www.rtlinux.org/
Seetron: http://www.seetron.com/