Apache CloudStack
Apache CloudStack is an opensource Infrastructure as a Service (IaaS)
... organizations want with an IaaS cloud: compute orchestration, Network-as-a-Service, user and account management, a full and open native API, resource accounting, and a first-class User Interface (UI). CloudStack currently supports the most popular hypervisors: VMware, KVM, Citrix XenServer, Xen Cloud Platform (XCP), Oracle VM server and Microsoft Hyper-V. Users can manage their cloud with an easy to use Web interface, command line tools, and/or a full-featured RESTful API.