Max Payne, Duke-Nukem 3D, Doom 1-2, Blood 1, maybe Half-Life 2, Half-Life 1, Quake Live (its free), deus ex, Call of duty 1, system shock 2, Wolfenstein 3D, almost all Command and Conquers, Titan Quest?, Halo, Terraria, Counter Strike 2D (its also free), tyrian 2000, Fallout 1, 2. Take also a look at this website: GOG.com