The following is a list of over one dozen free web hosting control panels. Some of the web hosting control panels listed below haven’t been updated for years now and others are very active.
ISPConfig
http://www.ispconfig.org/
Kloxo
http://lxcenter.org/software/kloxo
CentOS Web Panel (CWP)
http://centos-webpanel.com/
VHCS
http://www.vhcs.net/
DTC
http://gplhost.com/software-dtc.html
Vesta Control Panel
https://vestacp.com/
Virtualmin
https://www.virtualmin.com/
Webmin
http://www.webmin.com/
Easy Hosting Control Panel (EHCP)
http://www.ehcp.net/
Sentora
http://www.sentora.org/
Ajenti
http://ajenti.org/
Froxlor
https://www.froxlor.org/
BlueOnyx
https://www.blueonyx.it/
ispCP
http://sourceforge.net/projects/ispcp/
OpenPanel
http://download.openpanel.com/
ZPanel
http://www.zpanelcp.com/