UOFiddler based on Ultima SDK it's a tool to view and alter almost every UO 2D client file. Source code is released under the Beerware license.

An Ultima Online emulator sponsored by PlayUO.org -

Nerun's Distro is a script for RunUO centered on the settlement of the game, using the Premium Spawner engine. Easy to use, this distro includes spawns for a 100% spawned world, and tutorials in en…

An Ultima Online server emulator written in C# .NET

RunUO