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:

• Windows [DirectX 11 or OpenGL]
• Linux [OpenGL]
• macOS [Metal or OpenGL]

Download & Play!

Platform	Link
Windows x64	Download
Linux x64	Download
macOS	Download

Or visit the ClassicUO Website

How to build the project

Windows

The binary produced will work on all supported platforms.

You'll need Visual Studio 2019. The free community edition should be fine. Once that is installed:

1. Open ClassicUO.sln in the root of the repository.

2. Select "Debug" or "Release" at the top.

3. Hit F5 to build. The output will be in the "bin/Release" or "bin/Debug" directory.

Linux

Open a terminal instance and put the following commands:

1. sudo apt-get install mono-complete

2. sudo apt-get install monodevelop

3. Select "Debug" or "Release" at the top.

4. Hit F5 to build. The output will be in the "bin/Release" or "bin/Debug" directory.

macOS

All the commands should be executed in terminal. All global package installs should be done only if not yet installed.

1. Install Homebrew, a package manager for macOS (if not yet installed): Follow instructions on https://brew.sh/

2. Install Mono (https://www.mono-project.com/): brew install mono

3. Install NuGet, a package manager for .NET (https://docs.microsoft.com/en-us/nuget/): brew install nuget

4. Navigate to ClassicUO root folder: cd /your/path/to/ClassicUO

5. Restore packages (https://docs.microsoft.com/en-us/nuget/reference/cli-reference/cli-ref-restore): nuget restore

6. Build:

• Debug version: msbuild /t:Rebuild /p:Configuration=Debug
• Release version: msbuild /t:Rebuild /p:Configuration=Release

7. Run ClassicUO via Mono:

• Debug version: DYLD_LIBRARY_PATH=./bin/Debug/osx/ mono ./bin/Debug/ClassicUO.exe
• Release version: DYLD_LIBRARY_PATH=./bin/Release/osx/ mono ./bin/Release/ClassicUO.exe

After the first run, ignore the error message and a new file called settings.json will be automatically created in the directory that contains ClassicUO.exe.

Other useful commands:

• msbuild /t:Clean /p:Configuration=Debug
• msbuild /t:Clean /p:Configuration=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:

• OrionUO
• Razor
• UltimaXNA
• ServUO

This work is released under the GPLv3 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) © 2020 Electronic Arts Inc. All Rights Reserved.