Good and lightweight web based KVM manager

I'm looking for KVM manager that is free, web based, lightweight, and easy to use to manage multiple dedicated server for my personal use. Need the ability to install Windows and Linux on its virtual machine so choosing KVM as the virtualization platform.

If we read the following pages there will be some KVM manager we can choose in accordance with above criteria. After comparing it, the choice narrowed down to WebVirtMgr and Proxmox VE.