Vmware vSphere ESXi Microsoft Hyper-V IBM PowerVM Parallel Server bare metal Xen Hypervisor Oracle VM VMware Server VMware Workstation Virtual Server 2005 R2 Virtual PC 2007

Virtual Box Citrix – “thin” client systems provider Oracle VM Server for x86 Parallels, Inc. – for Mac QEMU – open source VirtualBox – open source Xen – open source OpenStack – open source KVM – open source