Gump Studio
From RunUO Wiki
Gump Studio
This program allows you to build gumps and then save them as file or script for use on your UO server.
Gump Studio 1.7 Tutorial
Gump Studio makes extensive use of a modified version of the UOSDK written by Krrios, available at www.runuo.net The RunUO community contributed Melanius created artwork, and several more ideas. Special thanks go to DarkStorm of the Wolfpack emulator for helping decode unifont.mul, allowing me to display UO fonts correctly.