Karesansui is the best web based kernel-based Virtual Machine (KVM) and Xen Manager.
Also one of the leading Japanese open source project.
Karesansui has Simple, easy web-based interface. Easy installation. Saves initial cost to use. Free for all.
Supports Xen/Kernel-based Virtual Machine(KVM) hypervisor. Other hypervisors/virtualization support on future plan.
Please refer the project URL for more information- http://karesansui-project.info/
* How to install –
Please go through the steps as mentioned here- http://karesansui-project.info/wiki/1/En_tutorial