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.
NethServer - NethServer is an operating system for Linux enthusiasts, designed for small offices and medium...
Webmin - Webmin is a web-based interface for system administration for Unix.
ClearOS - A very good alternative for Windows Server, for free
Vesta Control Panel - – What I love about Vesta is that it's fast and easy to use
OpenMediaVault - OpenMediaVault is the next generation network attached storage (NAS) solution based on Debian Linux.