- Home: https://www.classicuo.eu/
- Inspiration: Ultima Online
- State: beta
- Keyword: role playing, client, clone, content open, multiplayer online + massive
- Code repository: https://github.com/ClassicUO/ClassicUO.git (@created 2018, @stars 521, @forks 304)
- Code language: C#
- Code license: 4-clause BSD
- Developer: 3HMonkey, aclark13, Alias, Andrea Angelini, andreakarasho, anethus, Benjamin Willard, broxen, c0mput3rxz, deccer, dissident, dissident76, Frederick Parotat, gaechti, Jaedan, Jakub Linhart, James, jkachhad, Marcelo Paez Sequeira, Mel, Peter Wedder, Plugtopus Agency, Quick, Ranzik, rdegelo, Rob C., Ron Superior, roxya, Samuli Yliniemi, Sascha, Siva, Stefan, Tad Taylor, TannerBist, therightstatement, Timur Alekseenko, Tony, tonyuo, Voxpire