CrossUO: Ultima Online
Get CrossUO
Download & Play
Latest builds straight from GitHub Releases. No installers, no launchers.
Auto-detected for your platform; open the menu for all options.
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**Different supported platforms**Windows, Linux and macOS — x64, x86 and ARM, musl or libc and even a WASM web client.
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**One single binary**Everything bundled in a self-contained executable. No dependencies to chase.
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**No installers or launchers**Download, run, play. That's the whole process.
For Shard Owners
Free and Open Source Web Client
Put CrossUO to work for your community.
🌐Host it on your shard site
Shard owners can host the CrossUO web client directly on their own shard website, freely and at no cost. No gates, no accounts, no middlemen — players just click and play from the browser.
🛠Full control of features
Being fully open source, you decide exactly which features players can use with the integrated assistant, tailoring the client to your shard's ruleset.
🔒No lock-in
Open source means no lock-in and no hidden restrictions. Audit it, fork it, shape it — the client belongs to you, the community.
About the Project
What is CrossUO?
CrossUO is a ture open source Ultima Online® client reimplementation trying to honor to the original experience without excessive "modernisation". It aims to run on any platform, with a minimal sized single file executable to deliver a client compatible with all eras of the game.