Fping (open source) - fping is a program to send ICMP echo probes to network hosts, similar to ping, but much better performing when pinging multiple hosts.

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.

NetTK - NetTK, Network Tool Kit, is an Open Source alternative for monitoring and troubleshooting your...

Distill Web Monitor - Distill is a web monitoring tool. It can monitor RSS feeds, a webpage or a part of webpage. Alerts in the form of pop-up, audio or emails can be received.

NetCrunch Tools - Our free network tools offer ping scanning, SNMP scanning, port and network service scanning, and more.

Update Scanner - Update Scanner is a Firefox extension to monitor web pages for updates.