ISPConfig: Free Graphical Linux VPS Panel

ISPConfig is an open source virtual host management program for Linux with a web control panel. It can manage virtual hosts, open websites, open mailboxes, open and manage MySQL databases, support DNS resolution and monitor server health, IPTable firewall Shell service management and other functions through the web control panel.
Support different users, such as administrators, distributors, customers, etc. Compared to cpanel, it’s free.
Support Systems:
Debian 5 – 7 (recommended)
Ubuntu 8.10 – 13.04 (recommended)
CentOS 5.2 – 6.4
Fedora 10 and 12 – 15
OpenSuSE 11.1 – 12.3
Demo: Address: http://www.ispconfig.org/page/en/ispconfig/online-demo.html
Official documentation: http://docs.ispconfig.org/development/interface/

Modified version:
1. https://github.com/dclardy64/ISPConfig-3-Debian-Installer