Red Faction (1) - FPS
Aliens vs Predator 2 - FPS
Freespace 2 - Space Combat (FREE NOWADAYS!)
Freelancer - "Open" Space Combat
Psychonauts - Jump'n'Run I guess
Homeworld - RTS
Ground Control - RTS
Vampire - The Masquerade - RPG
Add Half-life 1, Battlezone 1, Prince of Persia and Thief: The Dark Project and you pretty much have named all of my 'favorite games of all time'.
