Warloch_Ahead: Unreal Tournament 2004 came with modding tools when I bought it on disc way back in the day, but GOG doesn't include them for some reason despite Fallout New Vegas and Morrowind having them. I guess you have to download the SDK from fansites, because it looks like official sources may be dead.
I went off and had a look and you're right.
Here's the readme.
This Bonus CD contains the following:
UPAINT
------
UPainter by Right Hemisphere is a painting and editing
application for customizing Unreal Tournament 2003 characters.
It interfaces directly with the installed retail version
of Unreal Tournament 2004 and uses a similar, familiar interface.
Characters can be loaded into the interface and customized
using different paint, brush and texture effects.
A face editing component lets you import a digital image and
place it on an existing Unreal Tournament 2004 character.
For installation instructions, see the Readme.txt file in
the Extras\UPaint folder. Once installed, detailed usage
information is available from the Help menu inside the program.
Maya (R) 5.0 Personal Learning Edition and UT 2004 plug-in
----------------------------------------------------------
Create high quality models and animations using Maya Personal Learning
Edition and the exclusive plug-in which interfaces directly with the Unreal Editor.
The self-installer in the Extras\MayaPLE folder requires you to register
online; detailed instructions are displayed on startup.
The accompanying plug-in, to be installed only after *both* UT2004 and
Maya Personal Learning Edition have been set up, allows direct export of
content into the UT2004 editor.
For important notes and requirements for the usage of Maya Personal Learning
Edition with the Unreal 2004 Editor, please refer to the HTML documentation,
available once the plug-in has installed itself into the My Documents folder:
My Documents\maya\5.0PLE\docs\UT2004 Help\index.html
KAT - UT2003 edition 1.2
------------------------
KAT is MathEngine's Karma Authoring Tool. It is used for setting up
the physics properties of characters when they are in 'ragdoll' mode.
This includes configuring joint types and limits, bone weights,
centers of mass etc. With KAT you can import your own .PSK file
containing a new character, set up the physical skeleton and save
it into a .ka file to be used in UT2003 or UT2004.
Alias SketchBook Pro Version 1.0.3 trial version
------------------------
The 15-day full-feature trial version of Alias SketchBook Pro,
a fast-loading sketching tool designed for pen-based digitized
tablets and tablet PCs.
========================================================================
Useful web links
========================================================================
Visit for the latest updates, patches, and community events:
http://www.unrealtournament.com Explore the Unreal Developer Network: frequently updated documentation
including extensive tutorials for programmers, mod authors, and
enthusiasts, straight from the Epic development team and other
teams using Unreal Technology:
http://udn.epicgames.com ========================================================================
Copyright notices
========================================================================
UPaint for UT2004 ©2004 Right Hemisphere Ltd. and ©2004 Epic Games, Inc. Raleigh, N.C. USA.
Maya is a registered trademark of Silicon Graphics, Inc., exclusively
used by Alias Systems, a division of Silicon Graphics Limited in the
United States and for other countries in the world.
The Maya logo is a trademark of Alias Systems, a division of
Silicon Graphics Limited in the United States and for other
countries in the world.
UnEditor plugin for Maya PLE ©2004 Secret Level and
©2004 Epic Games, Inc. Raleigh, N.C. USA.
MathEngine and Karma and the MathEngine and Karma logos are registered
trade marks or trade marks of MathEngine PLC, used under license.
Unreal® Tournament 2004 ©2004 Epic Games, Inc. Raleigh, N.C. USA.
Unreal and the Unreal logo are registered trademarks of Epic Games,
Inc. Raleigh, N.C. USA. ALL RIGHTS RESERVED.
All other trademarks and trade names are the property of their
respective owners.