[lightbritefight]

Look into XCP-NG. Its an excellent implementation of xenserver with a vsphere style single pain of glass called xen-orchestra. Its all FOSS and buildable from source.

It comes "batteries included" with backups/vsan/etc for an insanely reasonable "per host" license cost for support.

[burnt-resistor]

I already have. It's close. I did some integration work on a product that supported XenServer, xcp-ng, VMware vSphere, and Hyper-V.