VMware vSphere Hypervisor is a free, bare-metal hypervisor from VMware that allows users to virtualize their servers and consolidate applications.
Microsoft Hyper-V Server
Commercial
Microsoft Hyper-V Server is a stand-alone hyper-visor based virtualization product which includes live migration.
Proxmox Virtual Environment
Open Source
Proxmox VE is an open-source server virtualization management solution based on KVM and Linux Containers (LXC).
Citrix XenServer
Open Source
Citrix XenServer is the leading open source virtualization platform.
Compare oVirt with alternatives
Compare VMware vSphere Hypervisor and oVirt and decide which is most suitable for you.
Compare Proxmox Virtual Environment and oVirt and decide which is most suitable for you.
Compare Microsoft Hyper-V Server and oVirt and decide which is most suitable for you.
Compare Citrix XenServer and oVirt and decide which is most suitable for you.