

RunUO
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RunUO is a free, open-source Ultima Online server emulator written in C#. Originally founded by Ryan McAdams in 2002, RunUO has been the foundation for countless Ultima Online shards and has contributed significantly to the UO emulation community.
Cost / License
- Free
- Open Source (GPL-2.0)
Platforms
- Windows
- Mac
- Linux
- Self-Hosted
Features
- Support for scripting
- Extensible by Plugins/Extensions
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What is RunUO?
RunUO is a free, open-source Ultima Online server emulator written in C#. Originally founded by Ryan McAdams in 2002, RunUO has been the foundation for countless Ultima Online shards and has contributed significantly to the UO emulation community.
Features:
- Full UO Protocol Support: Complete implementation of the Ultima Online network protocol
- Dynamic Script System: Hot-swappable C# scripts for game content without server restarts
- Multi-Era Support: Compatible with multiple UO client versions
- Advanced Persistence: Robust world saving system with multiple save strategies
- Extensible Architecture: Modular design allowing easy customization and expansion
- Cross-Platform: Runs natively on Windows, Linux, and macOS with .NET 8
- Modern Platform: Built on .NET 8 for improved performance and cross-platform support


