ProBIND - ProBIND is a web application designed for managing the DNS zones for one or more servers running the ISC BIND DNS server software.
ServerSuit - ServerSuit is a browser based program that enables remote Linux administration, monitoring, website hosting, and server setup automation.
Atomia DNS - Atomia DNS is a free & open source DNS management system.
RedGate SQL Monitor - SQL Monitor helps you and your team find issues – before they become problems
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.
Nagios - Complete monitoring and alerting for servers, switches, applications, and services