cPanel - With its first-class support and rich feature set, cPanel & WHM has been the web hosting industry's most reliable, intuitive control panel since 1997.
SolusVM - Solus Virtual Manager (SolusVM) is a powerful GUI based VPS management system with full OpenVZ...
Virtualmin - It includes numerous features not in the GPL version (like script installers, resellers, HTML editor, an improved UI, mobile access, spam and virus filtering).
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.
Plesk - Plesk puts all the automation, security, and technical tools an IT professional needs in one simple and easy to use dashboard.
Xen Orchestra - A complete web UI for controlling a XenServer or Xen infrastructure.