Yahoo! Groups: Unreal Editing Yahoo! Groups: Unreal Editing: Mailing list archive and subscription information. (Modifications and Add-Ons) http://groups.yahoo.com/group/UnrealEditing/
UnrealWiki UnrealWiki: Open community documentation for UnrealEngine based modification development. (Modifications and Add-Ons) http://wiki.beyondunreal.com/wiki/
Squirrelinabox Technologies Squirrelinabox Technologies: Offers maps for capture-the-flag as well as a report for Unreal Tournament 2003. (Modifications and Add-Ons) http://siab.unrealplayground.com/
World of Unreal Maps World of Unreal Maps: Links, music, tutorials, and map and texture downloads. (Modifications and Add-Ons) http://www.caterman5.freeserve.co.uk/
Sinnical's Unreal Sinnical's Unreal: Information on maps, screenshots of works in progress, links, and news. (Modifications and Add-Ons) http://www.freewebs.com/sinnical/
The Mutation Device The Mutation Device: Tutorials, utilities, and forums devoted to creating mutators. (Modifications and Add-Ons) http://www.planetunreal.com/mutation/
Unreal University Unreal University: Two-day tutorial covering techniques for creating mods for the Unreal Tournament 2004 game engine held at North Carolina State University in Raleigh, North Carolina. (Modifications and Add-Ons) http://cde.ncsu.edu/uu2003/
Chimeric Chimeric: Resources for UnrealScript programming. (Modifications and Add-Ons) http://www.planetunreal.com/chimeric/
Lode's Unreal Zone Lode's Unreal Zone: Includes editing tutorials for lighting and movers. (Modifications and Add-Ons) http://www.planetunreal.com/lode
Oddities Oddities: Coding tutorials for creating unique game modifications. (Modifications and Add-Ons) http://www.planetunreal.com/oddities/