Games I have: Games I have NOT played are in ALL CAPS, games I haven't played much or haven't finished if single player are in [Brackets].

Xbox 360: (Not able to record at this time)
Call of Duty: Black Ops (all DLCs)
Call of Duty: Modern Warfare 3 (some DLCs)
Call of Duty: Black Ops 2 (Hardened edition preordered)

PC (Yes, I know most of these are very old, and several date back to my childhood and wouldn't be very interesting, but I'm including them for the sake of comprehensiveness):

These games I have on hoof:

The War Z (bought, not yet downloaded as I haven't been on Windows since)
DayZ
Call of Duty: World at War
All games in the Humble Bundle V

Games avaliable on Steam that I could redeem a key for:
Star Wars: Knights of the Old Republic
Star Wars: Jedi Knight 2: Jedi Outcast
Star Wars: Battlefront 2
Star Wars: Republic Commando
Star Wars: Jedi Knight: Dark Forces 2

Games that would require a trip home for: (may not be avaliable immediately)
Star Wars: Rebel Assault 2
Star Wars: Battlefront
Lego Star Wars
Lego Star Wars II: The Original Trilogy
The Mummy
Indiana Jones and the Emperor's Tomb
Age of Empires II: Age of Kings and The Conquerors
Age of Mythology and the Titans
The Lord of the Rings: The Battle for Middle Earth
The Lord of the Rings: The Fellowship of the Ring
The Lord of the Rings: The Return of the King
Typing Instructor (Some hilariously bad games in here)
Type to Learn (Some hilariously bad games in here)
Tom and Jerry in Fists of Fury
Need For Speed: High Stakes
Need for Speed III: Hot Pursuit (not to be confused with the 2010 version)
Need for Speed: Porsche Unleased
Maze Quest
The Chronicles of Narnia
Lego Island
Jurassic Park: Danger Zone
Jurassic Park: Operation Genesis
Sim Theme Park Gold Edition
Rollercoaster Tycoon and Loopy Landscapes
Monopoly Tycoon
Moon Tycoon
Bowling Mania
Bicycle Card Games
Over the Hedge
Lego Racers
Lego Racers 2
Lego Island 2
Sonic
Wheel of Fortune
Riddle of the Sphinx: An Egyptian Adventure
Any free game