Quake 3 engine (what did they rename it to ... idTech 3 ?) - Lots of great games on it like Quake 3, RTCW, MoHaa, CoD.
Source engine - although it's showing it's age in texture quality it's still a great engine.
Unreal engine 2 - same as Quake 3 engine, lots of great games on it.
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