UO Development Tools

UO Fiddler – This is the best program for viewing and doing some quick editing of all the MUL files. Can be for anything form viewing the game artwork to adding new animations. This is a very handy program.

InsideUO – This program is an alternative to UO Fiddler. It’s a bit older and does not read the newest game MUL files. But it still can be handy.

Mulpatcher – This is the best program for doing lots of editing to the MUL files. It’s a bit tricky to figure out at first but it’s by far the best program for editing everything. It can view and edit all of the MUL files.

PandorasBox – This program is primarily for decorating though it can do some other stuff.

UO Architect – This program is awesome. It lets you build buildings and then import then into the game. You can also export static building into a UOA file.

UO Landscaper – Program used for editing the map.

CentrED – This is a program is used for editing the map files. It’s a little tricky getting it all setup but once you do it up and running you can edit all of the map.

World Maker – This program is similar to CentrED. It allows you to edit the map maps.

Gump Studio – This program allows you to build gump and then save them as file or scripts for use in your server.

Region Editor – This program should allow you to edit regions. It does not work with the newer RunUO server version so we have not used it. But I think it should work fine with older server versions.

RadMap Copy – This is an older program used for copying parts of the map.

RadMap Worldforge – This is an older program that is used for manipulating the map.

UO Client Downloads

Razor – Razor offers UO players a chance to enhance and extend game play to enjoy new heights they never thought possible on player run shards. Razor is an assistant program – similar to the popular UOAssist – for player run Ultima Online shards. Razor offers features and functionality previously unheard of on unofficial shards.

AssistUO – Developed as a replacement for Razor, AssistUO is a brand new easy-to-use, featured, fast and stable Ultima Online assistant. It improves your game experience by allowing you to create flexible macros, use fast agents and enhanced game options.

UO Steam Download – UOS is a continuation of the AssistUO project. The developers split off from RunUO and renamed their project to UOSteam

Iris Client – Iris 2.0 is a cross-platform open-source (GPLv3) 2d/3d client for playing the Ultima Online” on Freeshards

Injection Client – Injection attempts to provide many of the features of the widely used UOAssist program. Unlike UOAssist, Injection is free software and it is designed for use with emulators, and will not work on official OSI servers. It can run standalone or as an Ignition plugin.

Official Client Download – This is the Official UO Client Download

UO Player Tools

Teamspeak 3
UO Cartographer
UO Automap Wiki
UO Automap Download
UO Loop Download
Easy UO

UO Admin Tools

RunUO Tool Archive

Nerun’s Spawner and Distributables
Nerun’s Dropbox

UO Script Libraries

RunUO – Custom Library
RunUO – Forum Releases
RunUO – Tools

ScriptUO Library
ScriptUO Individual Libraries

ServUO Library

JoinUO Library

UO Development Websites

Here are some great graphic/developer links, many are foreign sites, but have lots of information

Rubra Graphics


Nyray Graphics

Isis Pixel

UO Dev




Ultima Fonts
UO Game Fonts