XO is a web interface to visualize and administrate your XenServer (or XAPI enabled) hosts.
It aims to be easy to use on any device supporting modern web technologies (HTML 5, CSS 3, JavaScript) such as your desktop computer or your smartphone.
XO is developped by Vates SAS a small French company and released under the AGPL v3 licence. a XO is evolving fast, so check the known bugs file first.
Documentation
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How to report a bug?
Xen Orchestra has three bugtrackers: one for the server, one for the interface and the last one for common issues or when you don't know to which part it is related to.