Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
Winspector Spy - Have you ever used Spy++ that comes with MSVC?
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Window Detective - Window Detective is a programmer's tool used to "spy" on an application's windows...
Better Uptime - We call you when your website goes down
WinSpy - Retrieve window information.