Run your own private cloud, utilising OpenStack. Create virtual servers with ease, letting OpenStack manage allocating IP addresses, with machines ready to use in literally a minute or two! Integrate with Ceph for high availability, which enables Live Migration between multiple compute nodes without the need for downtime. Data replicated between Ceph Nodes to guarantee data integrity. Utilise many of OpenStack's components to expand your private cloud into something even more special.
A great alternative to running VMware ESXi or Citrix XenServer. OpenStack can be utilised not only with KVM virtualisation, but also with LXC containers, and also even integrate VMware ESXi or Citrix XenServer and allow them to be controlled by OpenStack.