Better History - Your Chrome Browsing history. Better.
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.
History Search - History Search remembers what's on all those websites you visit so you can find them again.
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.
Genie History Search - Always find the page you are looking for, like magic.
Update Scanner - Update Scanner is a Firefox extension to monitor web pages for updates.