In response to the GLiDE games list, I think it would be also useful to have a list of OpenGL games.
Either ones that are OGL only, or can be run in many API interfaces...(i.e. have an OGL 'mode' also)
I will edit this post as other people add to the list... 8)
OGL GAMES LIST BEGINS
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Quake series (1,2,3,4)
Doom 3 + Addon pack
Prey
Unreal Series (Unreal, U.T., 2K3, 2K4)
DeusEx
Bloodrayne
Star Wars Games
(JK - Jedi Outcast, JK - Jedi Academy)
Descent Games (Descent, Descent 2 / Infinite Abyss, Descent 3 Retribution / Mercenary)
Heretic 2
Falcon 4.0
Flanker 2.0
Hexen 2
Half Life Series (HL 1, Blueshift, OP-Force, HL2, HL2-EP1)
RTCW
Sin Series (Sin, Sin-EP1)
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I know I'm missing LOADS, but this is just to start things off...
Please help me add to the list!
==edit==
list updated as of 06/03/07