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RunUO Logo.png
Developer(s) RunUO Software
Stable release 2.5 / February 15, 2014; 19 months ago (2014-02-15)
Written in .NET Framework
Operating system Cross-Platform
Type Game Server
License GPL

RunUO is a project to create and maintain a freely available Microsoft .NET based Ultima Online server. The goal of the RunUO Software Team is to provide software that is scalable and capable of recreating the EA Games server environment.


RunUO started as a hobby. During the early part of 2002, Zac Torkelson began writing his own client for Ultima Online (a popular MMORPG). RunUO began as an aid in the client development process to simulate the actions of the Origin Systems shards. A few months later, Ryan McAdams, now the project manager of RunUO, convinced Torkelson to concentrate more on creating a new Ultima Online server emulator.

McAdams already had experience in maintaining websites and communities from past emulation ventures. On September 25, 2002 the first release was made, RunUO Beta 1.[1] During its beta phases, RunUO was released as a closed-source project. In less than three years and 40 betas (36 released to the public[2]), RunUO 1.0.0 was released on February 3, 2005.[3]

On June 15, 2006 a RunUO 2.0 release candidate was released, ushering in support for the latest game expansions and the new .NET 2.0 framework. That same day a public Subversion repository for RunUO was opened. This allows RunUO users to see the latest work being done on RunUO by the development team and submit their own patches to have features and fixes implemented in the main distribution.[4]

On February 7, 2008 A second Release Candidate for RunUO 2.0 was released with more than 165 bugs fixed and features added.[5]

On October 6, 2009 RunUO 2.0 Final was released, changes including over 100 SVN commits from 2.0 RC2, This also brings the first stable release of RunUO for Mono for use on GNU/Linux, BSD and similar platforms.[6]


RunUO is licensed under the GNU General Public License (GPL), and is available for download from RunUO GitHub.


RunUO is developed and maintained by Mark Sturgill.

Retired members of the RunUO software team are: krrios, Bryan Pass "Zippy",[7] Andre Sayre "ASayre", Jeffrey Boulanger,[8] Benjamin Willard "Ravenal", and John Lehman "Xavier".

EULA Violation[edit]

Please note disclaimer: Wikipedia does not give legal advice.

RunUO is not an approved third-party program,[9] and using it with the Ultima Online client is a violation of the End User License Agreement (EULA.) Electronic Arts may revoke an account if they suspect the owner has used a non-approved third-party application. Account revocation does not affect the ability to connect to third-party shards.

See also[edit]



  1. ^ For more information about the licensing, see OSI GPL Information.

External links[edit]

  • — Forms the backbone of the RunUO emulator community and provides forums for discussion, support, and script submissions.
  • RunUO GitHub — RunUO GitHub