An open source implementation of the Ultima Online Classic Client.

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Introduction

ClassicUO is an open source implementation of the Ultima Online Classic Client. This client is intended to emulate all standard client versions and is primarily tested against Ultima Online free shards.

The client is currently under heavy development but is functional. The code is based on the FNA-XNA framework. C# is chosen because there is a large community of developers working on Ultima Online server emulators in C#, because FNA-XNA exists and seems reasonably suitable for creating this type of game.

ClassicUO is natively cross platform and supports:

• Browser [Chrome]
• Windows [DirectX 11, OpenGL, Vulkan]
• Linux [OpenGL, Vulkan]
• macOS [Metal, OpenGL, MoltenVK]

Download & Play!

Platform	Link
Browser	Play!
Windows x64	Download
Linux x64	Download
macOS x64	Download

Or visit the ClassicUO Website

How to generate a release build

git clone --recursive https://github.com/ClassicUO/ClassicUO.git
cd ClassicUO/scripts
bash build-naot.sh

Binaries available in bin/dist folder

[!WARNING] To execute .sh scripts on Windows, use Git Bash which can be installed with Git itself: https://git-scm.com/download/win

Contribute

Everyone is welcome to contribute! The GitHub issues and project tracker are kept up to date with tasks that need work.

Legal

The code itself has been written using the following projects as a reference:

• OrionUO
• Razor
• UltimaXNA
• ServUO

Backend:

• FNA

This work is released under the BSD 4 license. This project does not distribute any copyrighted game assets. In order to run this client you'll need to legally obtain a copy of the Ultima Online Classic Client. Using a custom client to connect to official UO servers is strictly forbidden. We do not assume any responsibility of the usage of this client.

Ultima Online(R) © 2024 Electronic Arts Inc. All Rights Reserved.

Code Signing Policy

Free code signing provided by SignPath.io, certificate by SignPath Foundation.

This program will not transfer any information to other networked systems unless specifically requested by the user or the person installing or operating it.

People with direct push access:

• andreakarasho