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In the same vein, Proxmox is another choice, it's open source (or you can pay for support), also allows for GPU pass-through.

Proxmox is a management layer over LVM (and LXC), not a different virtualization technology.

I assume you mean KVM. Yes it's based on existing technologies, I wouldn't necessarily call it just a management layer however.

XenServer would be another similar choice that supports GPU passthrough. Depends a lot on what you're used to.