Modifications and Add-Ons

The Bullseye Crosshair Collection
Includes modifications for the Quake Series and Half-Life.
http://www.bullseyecrosshairs.com/

Cooltech Games
Patches and modifications for Half-Life, Unreal Tournament, and Quake.
http://cooltech.rocketage.org/ctgames.htm

Crosshair Central
Provides crosshairs for Central, Quake 2, Half-Life, Counter-Strike, Sin, and Kingpin, tools, and tutorials.
http://hosted.planethalflife.gamespy.com/cc/

DAV Levels
Levels and maps for Doom2, Heretic, Hexen, Half-Life, Quake and Quake2.
http://www.planetquake.com/davlevels/

Foyleman
Soldier of Fortune, Serious Sam, and Return to Castle Wolfenstein.
http://www.modsonline.com/

Garjen Software
Add-ons, custom levels and utilities for games such as Duke Nukem 3D, Wolfenstein, and Lemmings.
http://www.garjen.co.uk/

Grey Fusion
Tips and ideas for editing game engines for Half-Life, the Quake Series, Red Faction, and the Unreal Series.
http://www.greyfusion.net

M Planet
Includes mapping and level editing instructions, and downloads.
http://www.geocities.com/manneonline/

The Mastahuka Page
Offers maps for games including Half Life, Unreal Tournament and Blood.
http://www.geocities.com/rogeliogareizaga/index.html

Mirage's Maps
Maps for Half-Life and Quake 3.
http://xennon101.tripod.com/miragesmaps/

Poly Count
Includes downloads, modifications and game resources.
http://polycount.com/

Slacker's House
Unreal Tournament, Unreal Tournament 2003, and Quake 3 maps.
http://slackerz.8m.com

Super Capture the Flag
Includes game modifications, downloads and information. Plays on Quake and Half-Life.
http://www.sctf.net/

Total Conversions.com
Deals with modifications to games developed by 3DRealms.
http://www.TotalConversions.com

Ultimate Mapping
Maps for Counter Strike and Battlefield 1942.
http://www.angelfire.com/pro/nemo/

Vondur's War Supply
Includes custom maps for Quake, Quake2, Quake 3 Arena and Half-Life.
http://www.planetquake.com/vondur

VR21
Offers modifications and add-ons for several games, including Doom and Quake.
http://www.vr21.com/

Wavelength
Focuses on editing and game modification in Half Life, Quake and Unreal series games. Includes downloads, tutorials and utility downloads.
http://thewavelength.net/