Chimeric
- Resources for UnrealScript programming.
- http://chimeric.beyondunreal.com/

Mo's Maps
- Offers maps, and map-making tutorials for Unreal and Unreal Tournament 2004.
- http://www.ladymomaps.co.uk

Unreal Realm Of Concepts
- Maps, tutorials, and ideas for level design.
- http://home.comcast.net/~darendash/

Yahoo! Groups: Unreal Editing
- Mailing list archive and subscription information.
- http://groups.yahoo.com/group/UnrealEditing/

UnrealWiki
- Open community documentation for UnrealEngine based modification development.
- http://wiki.beyondunreal.com/wiki/

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.
- http://cde.ncsu.edu/uu2003/

The Mutation Device
- Tutorials, utilities, and forums devoted to creating mutators.
- http://www.planetunreal.com/mutation/

Lode's Unreal Zone
- Includes editing tutorials for lighting and movers.
- http://www.planetunreal.com/lode