- Arcanum Studios - - Modifications for Half Life 2 and Doom 3. Includes downloads and forums.
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- boodizm.net - - Offers modifications, maps, scripts, tutorials and utilities for Soldier of Fortune 2 and Quake 3 Arena.
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- Cooltech Games - - Patches and modifications for Half-Life, Unreal Tournament, and Quake.
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- Crosshair Central - - Provides crosshairs for Central, Quake 2, Half-Life, Counter-Strike, Sin, and Kingpin, tools, and tutorials.
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- 3D Map Realm - - Reviews of Quake 2, Half-Life and Unreal single player maps. Also provides testing services and a discussion forum.
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- DAV Levels - - Levels and maps for Doom2, Heretic, Hexen, Half-Life, Quake and Quake2.
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- Foyleman - - Soldier of Fortune, Serious Sam, and Return to Castle Wolfenstein.
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- Garjen Software - - Add-ons, custom levels and utilities for games such as Duke Nukem 3D, Wolfenstein, and Lemmings.
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- Grey Fusion - - Tips and ideas for editing game engines for Half-Life, the Quake Series, Red Faction, and the Unreal Series.
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- M Planet - - Includes mapping and level editing instructions, and downloads.
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- The Mastahuka Page - - Offers maps for games including Half Life, Unreal Tournament and Blood.
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- Mod Pages Network - - Modification downloads and reviews for games including Half-Life, Unreal Tournament, Quake II and III, Rainbow Six, and Rogue Spear.
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- PC Game Mods - - Maps and modifications. Covers Star Wars games, Doom 3, Half-Life 2, Enemy-Territory and Quake 3.
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- Poly Count - - Includes downloads, modifications and game resources.
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- Slacker's House - - Unreal Tournament, Unreal Tournament 2003, and Quake 3 maps.
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- Super Capture the Flag - - Includes game modifications, downloads and information. Plays on Quake and Half-Life.
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- VR21 - - Offers modifications and add-ons for several games, including Doom and Quake.
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- Wavelength - - Focuses on editing and game modification in Half Life, Quake and Unreal series games. Includes downloads, tutorials and utility downloads.
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