[Kryten]

No order, don't make me pick a favourite.

Geoff Crammond's F1GP
Space Invaders (had a cocktail cabinet in our house)
Freespace 2
Falcon 4.0
Elite
Doom
Wolfenstein 3D
Transport Tycoon Deluxe (now OpenTTD)
WoW
Skate or Die (C64)