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Game Institute: https://www.gameinstitute.com/gi/
Game Tutorials: http://www.GameTutorials.Com
GDSE - Games Development Search Engine: http://www.gdse.com/servlet/gdse.main
MakeGames: http://www.makegames.com/
PlanetQuake: http://www.planetquake.com/quake2/hosted/editing.shtml
References
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