Proxmox is #3 in Top 13 Virtualization platforms
Proxmox Virtual Environment is a complete server virtualization management solution, based on KVM virtualization and containers. Powerful and easy to use - Complete server virtualization management with KVM and containers.
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#3 in Top 13 Virtualization platforms
The best alternatives to Proxmox are: VMware vSphere, KVM, Citrix Hypervisor, Xen, OpenStack