<p align="center"> <a href="https://muo.gg"><img alt="ModernUO - Ultima Online Server Emulator for the modern era!" src="https://cdn.muo.gg/gh/muo-logo.svg" width=128px /></a> </p>

ModernUO

Ultima Online Server Emulator for the modern era!

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Requirements

Supported Operating Systems

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Required Frameworks

All Operating Systems

Windows

Development

Supported IDEs

<p align="left"> <a href="https://www.jetbrains.com/rider/download"><img height="64" title="Jetbrains Rider 2025.3+" alt="Jetbrains Rider 2025.3+" src="https://cdn.muo.gg/gh/jetbrains-rider.svg"></a> <a href="#"><img alt="space" width="32" src="https://cdn.muo.gg/gh/space.png"></a> <a href="https://code.visualstudio.com/download"><img height="64" title="VSCode" alt="VSCode" src="https://cdn.muo.gg/gh/vscode.svg"></a> <a href="#"><img alt="space" width="32" src="https://cdn.muo.gg/gh/space.png"></a> <a href="https://visualstudio.microsoft.com/vs/community/"><img height="64" title="Visual Studio 2026" alt="Visual Studio 2026" src="https://cdn.muo.gg/gh/vs2026.svg"></a> </p>

Getting Started

• Install prerequisite requirements
• Clone this repository (or download the latest):
  • git clone https://github.com/modernuo/ModernUO.git
• Open ModernUO.sln to start developing

Building/Publishing

Interactive Mode (Recommended for new users)

Run ./publish.cmd (Windows) or ./publish.sh (Linux/macOS) with no arguments to launch the guided build tool. It will:

• Check prerequisites (.NET SDK, native libraries)
• Walk you through configuration and platform selection
• Build and publish the server to the Distribution directory
• Show deployment instructions for cross-compiled builds

Command Line

shellCopy
./publish.cmd [release|debug] [os] [arch]

• os - Supported operating systems
  • win - Windows
  • osx - macOS
  • linux - Linux
• arch
  • x64 - Intel/AMD 64-bit
  • arm64 - ARM 64-bit

Linux Prerequisites

Fedora, CentOS, RHEL, etc

shellCopy
dnf upgrade --refresh -y
# CentOS does not come with EPEL enabled
dnf install -y epel-release epel-next-release
dnf install -y findutils libicu libdeflate-devel zstd libargon2-devel liburing-devel

Ubuntu, Debian, etc

shellCopy
apt-get update -y
apt-get install -y libicu-dev libdeflate-dev zstd libargon2-dev liburing-dev

OSX Requirements

shellCopy
brew install icu4c libdeflate zstd argon2

Running the Server

• Follow the publish instructions
• The Distribution directory is portable — copy it to your production server for deployment
• Run ModernUO.exe or dotnet ModernUO.dll from the Distribution directory
• On first run, the server will prompt you to configure game data file locations

Troubleshooting / FAQ

• See FAQ

Want to sponsor?

Thank you for supporting us! You can find out how by visiting the sponsors page.

Collaborators

Thanks

• RunUO Team & Community
• Voxpire, the ServUO Team & Community
• Karasho, Jaedan and the ClassicUO Community

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<p align=center>Development Tools & Plugins provided with &hearts; by<br/><br/><a href="https://www.jetbrains.com/?from=ModernUO"><img src="https://cdn.muo.gg/gh/jetbrains.svg" height="64px" alt="JetBrains" title="JetBrains" /></a><br/> <a href="https://material-theme.com/"><img src="https://github.com/AtomMaterialUI/material-theme-issues/raw/master/logo.svg" width="64px" alt="Material Theme" title="Material Theme"></a></p>

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

Teams & Roles

Approvers & Committers: Development Team