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Broadcom terminates VMware's free ESXi hypervisor
(www.theregister.com)
This is a most excellent place for technology news and articles.
XCP-NG, which I think was split off from an old Citrix branch or may be a clone, but it has a pretty solid set of features. Costs nothing unless you buy support or use their paid management appliance, but there's an open version of that available as well.
https://github.com/xcp-ng/xcp