Strange how many 'Classics' people are posting. Unreal 1 This game was super popular for years when it came out. I still sometimes return to this classic. S.T.A.L.K.E.R. Cult classic Alpha Centauri Often still regarded as the best strategy game of it's type. Homeworld One of the best space RTS games ever created, still praised for it's incredibly immersive storyline & soundtrack. I'd even argue that Deus Ex invisible war could be considered a classic, but people still seem mad at that game despite it being generally a pretty fun game.
I'd pick Arx Fatalis, but that's a classic too, so instead I have to pick Darwinia. Darwinia was a game that had a strong start with it's fanbase, but fell out of the publics eye just after a few short years to the point where I haven't seen anyone talk about it in about 5 years or so.
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Oni Giants: Citizen Kabuto Sacrifice MDK 1 & 2 Drakan: Order of the Flame Clive Barker's Undying Hidden and Dangerous MindRover (oh man... cannot say enough good things about this game) Wheel of Time
There were lots more, but those games were typically more obscure or underrated and don't come up in conversations all that often these days. I'm sure there are more I've missed, but those definitely hit my list at least...
"How do I get rid of a Trojan Horse?" -Sailor_Kakashi "Leave it outside the gates of Troy overnight." -Davel23