OSDev.org

I'm not sure if anyone here has actually used QNX, But they are releasing source code for the "Neutrino" microkernel.. and other system components as well..

The last version of QNX I tried was distributed on a floppy disk

I thought it looked neat though..

http://www.osnews.com/story.php/18596/Q ... ew-QNX-CEO
http://community.qnx.com/sf/sfmain/do/home

Wow, this is great news! I can finally confirm a lot of my speculation about how their low-level context switching & pre-emption works.