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