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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.
I find mentions on their homepage that they love open source but I can't find any repository for the hypervisor itself.
Nutanix AHV is based upon CentOS KVM.
https://www.nutanixbible.com/5a-book-of-ahv-architecture.html
I’m not sure if it’s open source, but it’s free.