I assume what you're looking for specifically here is a complete platform that you can install on bare-metal, not just the actual hypervisor itself. In which case consider any of these:
Proxmox
XCP-NG
Windows Hyper-V Server Core (basically Windows Server Nano with Hyper-V)
Any Linux distro running KVM/QEMU - Add Cockpit if you need a web interface, or use Virt-Manager, either directly or over X-forwarding
This is true, but not everyone gets to use a linux system as their main desktop at work. I'm not aware of a windows version of virt-manager, but if that exists it would be fucking rad.
I'm not sure why you're getting down voted, you're right. I'm not sure if anyone would run Proxmox for their enterprise hypervisor? I mean HyperV is okay. Slim pickings for big orgs. I know there's Nutanix, but most folks are moving to the big three for VMs and hosting.