ServerSuit - ServerSuit is a browser based program that enables remote Linux administration, monitoring, website hosting, and server setup automation.
Wachete - Track web page changes and get notified. Free Sign-up. Have all data in one place
RedGate SQL Monitor - SQL Monitor helps you and your team find issues – before they become problems
Visualping - Visualping is the easiest to use website checker, webpage change monitoring, website change detector and website change alert software of the web. Read more about Visualping.
Nagios - Complete monitoring and alerting for servers, switches, applications, and services
WebSite-Watcher - WebSite-Watcher detects website updates and highlights all changes in the text. WebSite-Watcher monitors web pages, password protected pages, disucssion forums and much more.