Website Monitoring Expert 

Website Monitoring Expert is a multithreaded website monitoring tool, watching different protocols, including HTTP(S), SMTP, POP3, FTP, TCP. It can log the server performance, generate real-time reports, and notify you upon detection of problem or error.
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DocuMonitor 

DocuMonitor is a multipurpose Web pages/files, FTP and local files content modification monitor. This product enables you check the changes of the Internet documents manually or automatically and cope with them faster.
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Websync 

Websync is an internet monitor which can periodically scan for changes in favourite websites and inform the user of changes. In addition it can download websites to local discs, removing undesirable links such as adverts (fully user configurable).
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Atomic Watch 

Website Downtime = Lost Revenue Watch your website to ensure you minimize downtime and maximize uptime. If your website is down, search engines may remove your site, partners may remove links to your site, ensure your site is up at all times.
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