Still have that floppy demo somewhere in the attic, but used to boot the live CD demo from within Windows.
QNX, retail 49.99 Dollars was a long time the best alternative for Unix-like OS, and it is a real-time OS. Speaking of the days of SCO-Unix or Interactive it had not the merited success given the low price.
Some fast drivers for cards as the old Matrox'es...
Mostly used now in fab/processing/manufacturing, well ..., where RT matters.
Should re-check, or, after a couple of beers,
order (Geez!) a license.
Had almost anything I needed, but FLOSS.