A web-based front-end to VirtualBox written in PHP
phpVirtualBox - An open source, AJAX implementation of the VirtualBox user interface written in PHP. As a modern web interface, it allows you to access and control remote VirtualBox instances.
phpVirtualBox is designed to allow users to administer VirtualBox in a headless environment - mirroring the VirtualBox GUI through its web interface.
VirtualBox DashBoard - PHP application for managing multiple VirtualBox server instances from a web interface. Also integrates with phpVirtualBox for host control.
vpsAdmin is an powerful opensource web-gui application for administration of OpenVZ servers written in PHP 5.2 + BASH scripts. It uses MySQL 5 database for storing and replicating data.