LynxOS

LynuxWorks, Inc.
3 operating systems for embedded systems: BlueCat Linux, BlueCat RT (real-time Linux), and the POSIX-conformant, hard real-time LynxOS operating system for mission-critical applications. ISO 9001 certified processes and state-of-the-art support infrastructure.
http://www.lynuxworks.com/

LynxOS
Growing article, with links to many related topics. Wikipedia.
http://en.wikipedia.org/wiki/LynxOS

README for XFree86 4.0.1 on LynxOS
High availability drivers for LynxOS.
http://www.xfree86.org/4.0.1/LynxOS.html