News: uo.wzk.cz moved from WordPress to Hugo in March 2026 and merged the Manawydan Ultima Online tools archive rescued by Golfin.
CentrED# is a C# rewrite of the CentrED client/server map editor for Ultima Online by kaczy93, running on Windows, Linux and macOS. MIT licensed.
XMLSpawner 2.1 is the XML-based spawner system for RunUO and ServUO Ultima Online servers, with conditional spawns, quests and attachments.
WolfPack 12.9.13 Beta is an Ultima Online server emulator in C++ with game logic scripted in Python, editable without recompiling the server.
vServerLauncher 1.1 downloads, installs and runs the latest SphereServer nightly build with scripts and helper tools in a few clicks.
Vita-Nex: Core 5.2.0.0 is a C# framework extension for RunUO and ServUO Ultima Online servers with PvP battles, events, notify and utility systems.
vCrypter 1.2 calculates Ultima Online login encryption keys for a given classic or enhanced client version, for use in sphereCrypt.ini.
UOX3 (Ultima Offline eXperiment 3) is one of the oldest Ultima Online server emulators, written in C++. Windows and Linux 0.99.2b packages.
UOSteam 1.0.5 is an Ultima Online assistant with its own macro language for movement, combat and item handling. Includes docs and script repo.
UoPlugIn 4.2 by Ashran and Beosil (1998) patches the Ultima Online client in memory at runtime to add options such as showing hitpoints.
UOMON 1.16 is a public-domain login server monitor that polls the official Ultima Online login servers and starts the client when one is up.
UoLoopX is a macro loop program for the Ultima Online client, a newer relative of UO Loop, archived with an Italian version and PDF help.