1)   PA Server Monitor 3.4
PA Server Monitor is a Windows service that monitors the health and availability of Windows servers, network services (on Windows, Linux and other operating systems), and devices. No agents are needed to monitor remote servers. Rich reporting too.

 2)   PA Server Monitor Free Edition 3.1.9
PA Server Monitor has powerful features that are very simple to setup. The Free edition monitors web pages, ping response and the Windows event log, and includes several response actions such as email, reboot, etc. Monitored resource reports too.

 3)   UpdatePatrol - A Website watcher 2.1
Select which web sites to watch, and how often you want these web pages searched. The program will work silently in the background, and notify you when there are changes to the selected sites or blogs. View the sites with changes highlighted.