Scriptable, distributed and object oriented Hosting Platform. Manage Clients, Resellers, Domains, Backups, Stats, Mails and Databases. Manage everything!
ISPConfig 3 is an open source hosting control panel for Linux which is capable of managing multiple servers from one control panel. ISPConfig is licensed under the BSD license.
Webmin is a web-based interface for system administration for Unix. Using any modern web browser, you can setup user accounts, Apache, DNS, file sharing and much more.