"So we have a few great Free Software gaming engines now, like DarkPlaces used in Nexuiz, Cube 2 used in Sauerbraten, Qfusion used in Warsow, soon id Tech 4 which is used in id Software's Quake 4, Doom 3, Enemy Territory: Quake Wars along with many others, and the HPL1 engine used in Frictional Games' "Penumbra: Overture".
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