- Home: https://crossuo.com/
- Inspiration: Ultima Online
- State: mature
- Platform: Windows, Linux, macOS
- Keyword: role playing, client, clone, content open, fork OrionUO, multiplayer online
- Code repository: https://github.com/crossuo/crossuo.git (@created 2019, @stars 160, @forks 32)
- Code language: C, C++
- Code license: GPL-3.0
- Developer: Artem Ivanov, Danny Angelo Carminati Grein, Deuce, Everton Fernando Patitucci da Silva, GarantEEG, Hotride, Jakub Linhart, Jean-Martin Miljours, John, Münir Ozan Topcu, Nic84, Olivier Abdesselam, Sascha, Solandus, Val, Valentyn Andrushko, yazgoo
- Build system: CMake