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.
ServerSuit - ServerSuit is a browser based program that enables remote Linux administration, monitoring, website hosting, and server setup automation.
Vesta Control Panel - – What I love about Vesta is that it's fast and easy to use
RedGate SQL Monitor - SQL Monitor helps you and your team find issues – before they become problems
ISPConfig - ISPConfig 3 is an open source hosting control panel for Linux.
Nagios - Complete monitoring and alerting for servers, switches, applications, and services