cutestat - Website Stats and Valuation. CuteStat.
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.
WebsiteOutlook - WebsiteOutlook is an all-in-one website that provides you detailed information on famous websites based on various data sources like traffic, page rank, and estimated ad revenue.
Wachete - Track web page changes and get notified. Free Sign-up. Have all data in one place
Rankchart - Rankchart is one of the unique websites that allows you to examine your websites or watch competitors and locate rich information about website technologies, site reputation, errors, SEO, and ad-word recommendations.
Update Scanner - Update Scanner is a Firefox extension to monitor web pages for updates.