SolusVM - Solus Virtual Manager (SolusVM) is a powerful GUI based VPS management system with full OpenVZ...
VMmanager - VMmanager is a QEMU/KVM server virtualization management software, which presents perfect tools for creating virtual machines, providing VPS services, and building cloud infrastructure.
Xen Orchestra - A complete web UI for controlling a XenServer or Xen infrastructure.
oVirt - oVirt is a virtualization management application.
Fleio - OpenStack billing software and control panel for service providers;
clearVM - The best-looking virtualization platform on the planet. With the fastest setup. Ease of use. And zero maintenance.