VMware hypervisors of the ESX family (3.x, 4.x and 5.0) are fully, out-of-the box supported by the latest versions of OpenNebula(3.0+). If you have a server farm based on any of the ESX versions, then you can make use of OpenNebula to better manage your physical (and virtual) resources in order to build a private cloud and provide virtualized environments. OpenNebula is the most powerful open-source alternative to VMware datacenter and cloud suite, delivering enterprise-class functionality, stability and scalability with broader platform support and integration capabilities.