Proxmox
From ISSW
Proxmox Virtual Environment is a free and easy to use Open Source virtualization platform for running Virtual Appliances and Virtual Machines. It is a Debian based Linux image that provides OpenVZ and KVM virtual platforms side-by-side, all managed with a simple web interface.
For more information, including downloads links, visit http://pve.proxmox.com/wiki/Main_Page.
For a guide to Proxmox, including clustering and live migration, see the HowToForge page.
Ready-to-run appliances are available at http://download.proxmox.com/appliances
