JustUO was a popular community-maintained fork of RunUO that focused on fixing bugs and adding modern features. The archive includes the full JustUO source along with uo-crystal-master, a massive collection of over 41,000 files including custom scripts, systems, and expansion content. JustUO served as a bridge between RunUO 2.x and the later ServUO project.
Archived from the UO FreeShard Community Tool Box (archive.org, 2019).
Mass M Decompiler (Publish 7) is a decompilation and analysis tool for Ultima Online server scripts and data. It includes a VB.NET UO Demo Class Library for programmatic access to UO data structures. Contains 232 files across multiple projects — useful for reverse engineering game mechanics or migrating scripts between server platforms.
Archived from the UO FreeShard Community Tool Box (archive.org, 2019).
Multi Scripter 1.1 is a bulk script processing tool for UO server development. It enables batch operations on multiple script files simultaneously — useful for large-scale script migrations, formatting changes, or content generation across entire server script packages.
Archived from the UO FreeShard Community Tool Box (archive.org, 2019).
MultiList (Beta Release 5) is a viewer and browser for Ultima Online multi objects — structures composed of multiple tiles such as houses, castles, boats, and other complex in-game buildings. It allows previewing multi definitions from the multi.mul file, inspecting individual components, and exporting multi data. Useful for shard developers working with custom housing or structure designs.
Archived from the UO FreeShard Community Tool Box (archive.org, 2019).
The Mythic Package Editor is an essential tool for working with UO’s modern UOP (Ultima Online Package) file format, introduced when Mythic Entertainment took over development. UOP files replaced the classic MUL format for storing game assets in newer client versions. This editor allows viewing, extracting, and modifying the contents of UOP packages including art, gumps, animations, and other game data. Version 1.2 includes a help file and dictionary for the package format. Critical for anyone working with Stygian Abyss or later client versions.
A custom installer for Notepad++ 4.1.2 preconfigured with syntax highlighting for Sphere SCP (Server Control Program) script files. Provides color-coded editing for Sphere server scripts with proper recognition of SCP keywords, section headers ([ITEMDEF], [CHARDEF], [DIALOG], etc.), triggers (ON=), and properties. Makes editing large Sphere script packages significantly more productive than using a plain text editor.
Archived from the UO FreeShard Community Tool Box (archive.org, 2019).
OrB Multi Template Manager 1.0 is a tool for managing and editing multi (building/structure) templates in Ultima Online. It provides an organized interface for creating, importing, and modifying multi definitions used for houses, castles, and other in-game structures. Part of the OrB (Orbsydia) suite of UO development tools.
Archived from the UO FreeShard Community Tool Box (archive.org, 2019).
OrionUO is an open-source alternative Ultima Online client written in C++. It provides improved rendering performance, modern resolution support, and additional features not available in the official EA client. OrionUO includes its own configuration editor and the Orion Assistant (OA) for macro and automation functionality. The client supports both classic MUL files and modern UOP format. This archive contains the full source code and precompiled binaries including dependencies (FreeImage, GLEW, BASS audio).
POL (Penultima Online) is an alternative Ultima Online server emulator written in C++ with an eScript scripting language. Unlike RunUO’s C# approach, POL uses its own lightweight scripting system designed specifically for UO server development. POL was popular in the European freeshard community and offered excellent performance for large player counts. This archive contains the full source code with build system (CMake), test suites, and documentation.
POLGumpExport is a utility for exporting gump (graphical user menu popup) definitions for use with the POL server emulator. It converts gump designs into POL’s eScript format, making it easy to create in-game dialog windows for POL-based servers.
Archived from the UO FreeShard Community Tool Box (archive.org, 2019).
UO Tools Archive