Modifications and Add-Ons Links - Gaming Internet Directory

World of Unreal Maps - Links, music, tutorials, and map and texture downloads.

Sinnical's Unreal - Information on maps, screenshots of works in progress, links, and news.

Squirrelinabox Technologies - Offers maps for capture-the-flag as well as a report for Unreal Tournament 2003.

Chimeric - Resources for UnrealScript programming.

Lode's Unreal Zone - Includes editing tutorials for lighting and movers.

The Mutation Device - Tutorials, utilities, and forums devoted to creating mutators.

Oddities - Coding tutorials for creating unique game modifications.

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.

UnrealWiki - Open community documentation for UnrealEngine based modification development.

Yahoo! Groups: Unreal Editing - Mailing list archive and subscription information.