- The Bullseye Crosshair Collection - Includes modifications for the Quake Series and Half-Life.
- Cooltech Games - Patches and modifications for Half-Life, Unreal Tournament, and Quake.
- Crosshair Central - Provides crosshairs for Central, Quake 2, Half-Life, Counter-Strike, Sin, and Kingpin, tools, and tutorials.
- DAV Levels - Levels and maps for Doom2, Heretic, Hexen, Half-Life, Quake and Quake2.
- Foyleman - Soldier of Fortune, Serious Sam, and Return to Castle Wolfenstein.
- Garjen Software - Add-ons, custom levels and utilities for games such as Duke Nukem 3D, Wolfenstein, and Lemmings.
- Grey Fusion - Tips and ideas for editing game engines for Half-Life, the Quake Series, Red Faction, and the Unreal Series.
- M Planet - Includes mapping and level editing instructions, and downloads.
- The Mastahuka Page - Offers maps for games including Half Life, Unreal Tournament and Blood.
- Mirage's Maps - Maps for Half-Life and Quake 3.
- Poly Count - Includes downloads, modifications and game resources.
- Slacker's House - Unreal Tournament, Unreal Tournament 2003, and Quake 3 maps.
- Super Capture the Flag - Includes game modifications, downloads and information. Plays on Quake and Half-Life.
- Total Conversions.com - Deals with modifications to games developed by 3DRealms.
- Ultimate Mapping - Maps for Counter Strike and Battlefield 1942.
- Vondur's War Supply - Includes custom maps for Quake, Quake2, Quake 3 Arena and Half-Life.
- VR21 - Offers modifications and add-ons for several games, including Doom and Quake.
- 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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