An open source implementation of the Ultima Online Classic Client.
Individuals/hobbyists: support continued maintenance and development via the monthly Patreon:
Individuals/hobbyists: support continued maintenance and development via PayPal:
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 | Download |
Or visit the ClassicUO Website
How to build the project
Clone repository with:
git config --global url."https://".insteadOf git://
git clone --recursive https://github.com/ClassicUO/ClassicUO.git
Build the project:
dotnet build -c Release
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:
Backend:
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) © 2022 Electronic Arts Inc. All Rights Reserved.