Hi,
just something small that I recognized when I read the text about what XOA is for and it does only mention Citrix Hypervisor but not XCP-NG in the text, just in the title here:
https://xen-orchestra.com/#!/xo-features/webinterface
Xen Orchestra is designed to give you the tools you need to administrate your Citrix Hypervisor (XenServer) pools and enjoy a complete overview of your whole infrastructure. No agent to install on your hosts, you can access everything from anywhere and from any devices.
Maybe you want to mention XCP-NG there with a link to "xcp-ng.org".