Web Hosting Control Panel

Virtualmin
http://www.webmin.com/virtualmin.html
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Virtualmin is a Webmin module for managing multiple virtual hosts through a single interface, like Plesk or Cpanel.

VHCS - Virtual Hosting Control System
http://www.vhcs.net/
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VHCS is open source control panel for Linux based server management. VHCS is designed for hosting and internet service providers and IT professionals.

DirectAdmin Control Panel
http://www.directadmin.com/
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DirectAdmin is the easiest to use control panel, the fastest running control panel.

web-cp Control Panel
http://www.web-cp.net/
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web-cp is a full-featured, open source web hosting control panel written in PHP and released under the GPL.