This site has been fully rebuilt and expanded. Here’s what happened.

WordPress to Hugo

The original uo.wzk.cz ran on WordPress since 2009, hosting 17 UO tool pages with 27 download files. In March 2026, the entire site was migrated to Hugo (a static site generator) and deployed on Cloudflare Pages. All original content, downloads, and URLs have been preserved.

Why the move? WordPress was overkill for what is essentially a frozen archive — no comments, no dynamic content, just static tool pages and downloads. Hugo builds the entire site in under a second, costs nothing to host, and will keep working for years without maintenance.

CentrED# is a complete C# rewrite of the original CentrED map editor for Ultima Online, created by kaczy93. It is the recommended modern alternative to both CentrED and CentrED+.

Features

• Client/Server map editor (same architecture as original CentrED)
• Cross-platform: Windows, Linux, macOS (including Apple Silicon)
• Built on .NET — no legacy FreePascal/Lazarus dependencies
• Active development (722 commits, v0.6.11.30 as of February 2026)
• MIT license
• Acknowledges work from ServUO, ModernUO, ClassicUO, and UOFiddler

Downloads

Latest release: v0.6.11.30 (February 7, 2026)

The 4GB Patch (also known as Large Address Aware patch) is a tiny but essential utility that modifies 32-bit Windows executables to use up to 4 GB of virtual memory instead of the default 2 GB limit. For Ultima Online, this is particularly useful when loading large custom maps, high-resolution textures, or running heavily modified clients that would otherwise crash with out-of-memory errors. Simply run the patch on your client.exe to enable the expanded memory space. Works on any 32-bit PE executable.

A comprehensive collection of script archives for multiple UO server platforms. Includes the Complete RunUO Script Archive (48 MB, September 2013), Complete Orbsydia Script Archive (10 MB), Daat99 OWLTR (Old World Loot and T-Map Revamp) for RunUO 2.0, custom RunUO scripts, the SphereServer Community Script Pack (r367), and UOSteam custom macro scripts. An invaluable resource for shard developers looking for pre-built game systems and content.

Download

• Assorted Scripts Collection (65 MB)

Archived from the UO FreeShard Community Tool Box (archive.org, 2019).

Client Auto Update 0.87 is a patching and auto-update system for UO freeshard clients. It allows shard operators to distribute client file updates to their players automatically. When players launch the updater, it connects to the shard’s patch server, checks for new files, and downloads only the changed content. Simplifies the process of pushing custom art, map changes, or configuration updates to the player base.

Downloads

• Client Auto Update 0.87 (3.3 MB)

Archived from the UO FreeShard Community Tool Box (archive.org, 2019).

Cliloc Editor 2 is a tool for editing Ultima Online’s cliloc (Client Localization) files. These files contain all the text strings displayed in the UO client — item names, system messages, skill descriptions, spell names, and more. Shard developers use this editor to customize text for localized or custom content servers. The editor allows searching, editing, adding, and removing text entries by their numeric cliloc ID. Essential for any shard that needs custom item names or translated content.

ConnectUO was the premier server browser and launcher for Ultima Online freeshards. It allowed players to discover, compare, and connect to hundreds of private servers from a unified interface. The application displayed server status, player counts, custom features, and provided one-click connection. The archive includes the ConnectUO Desktop Beta 0.2.3.3, an older version, and the full source code — valuable for anyone wanting to build a similar server listing system.

Damage Calculator is a combat mathematics tool for Ultima Online. It computes damage output based on weapon stats, skills, resistances, and various modifiers, helping shard developers balance combat mechanics and players optimize their character builds. Supports the UO damage formula with all standard variables.

Download

• Damage Calculator (130 KB)

Archived from the UO FreeShard Community Tool Box (archive.org, 2019).

Dialog Studio 1.4 (Final) is a visual dialog and gump designer for Sphere server. It provides a WYSIWYG editor for creating in-game dialog windows (gumps) with buttons, text fields, images, and checkboxes, then exports the SCP script code ready to paste into your Sphere server scripts. The tool includes a built-in item browser with UO core data files for previewing gump elements. Contains 196 files including templates and documentation.

Download

• Dialog Studio 1.4 Final (2.4 MB)

Archived from the UO FreeShard Community Tool Box (archive.org, 2019).

EasyUO is the most popular scripting platform for Ultima Online automation. It uses a custom scripting language designed specifically for UO, allowing players to write complex automation scripts for crafting, resource gathering, combat, and more. The archive includes multiple EasyUO versions (1.42, 1.5), the Codename Alexandria complete package (a modern EasyUO distribution with static libraries and redist packages), OpenEUO (the open-source successor), and the EasyUO MD documentation. At 130 MB this is the definitive EasyUO archive.