Clocker - Keep track of people in different time zones

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.

Dato - Better menu bar clock with calendar and time zones

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.

Clock mini - Simple clock app in the Dock

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