The Xen Project allows vendors to advertise services and software that use Xen and/or build on top of Xen to advertise their services and/or software in the Xen Project Directory. For more information read the vendor notes.
CloudStack is open source software written in java that is designed to deploy and manage large networks of virtual machines, as a highly available, scalable cloud computing platform. CloudStack current supports the most popular open source hypervisors VMware, Oracle VM, KVM, XenServer and Xen Cloud Platform. CloudStack offers three ways to manage cloud computing environments: a easy-to-use web interface, command line and a full-featured restful API.