Aegir Hosting System
Aegir is a free and open source Unix based web hosting control panel program that provides a graphical interface designed to simplify deploying and managing Drupal web sites. Aegir is built on a standard LAMP stack, and Drush, a command line shell and Unix scripting interface for Drupal. It extends Drush with various provisioning functions, and provides a Drupal-based front-end control-panel.
In addition to the GUI interface, Aegir can be accessed via the command line or an API, which enables the automation of many website-related system administration processes. Being based on Drupal and Drush, Aegir is highly extensible, and several contributed modules exist to extend its functionality.
History
Adrian Rossouw, a long-time contributor to the Drupal project, helped develop the original Hostmaster system for deploying websites. Since then, Hostmaster has evolved into the Aegir system and contributed significantly to the command-line toolkit, Drush.