ProBIND - ProBIND is a web application designed for managing the DNS zones for one or more servers running the ISC BIND DNS server software.
cPanel - With its first-class support and rich feature set, cPanel & WHM has been the web hosting industry's most reliable, intuitive control panel since 1997.
facileManager - facileManager is a modular suite of web apps built with the system administrator in mind. Say good-bye to manual management of services running on multiple servers.
Vesta Control Panel - – What I love about Vesta is that it's fast and easy to use
Webmin - Webmin is a web-based interface for system administration for Unix.
ISPConfig - ISPConfig 3 is an open source hosting control panel for Linux.