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
All of them not equate in same league. Do you know any type 1 free supervises out there? Xen probably.
Proxmox, Xen, hyper-v are all considered type 1 as far as I’m aware.
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: