YouMonitor.Us is a distributed peer-to-peer monitoring service that puts your web site to work monitoring other sites for downtime, while other sites keep an eye on yours. The service is free, provided that you volunteer some CPU cycles and bandwidth from your server to monitor other sites, and YMU provides detailed downtime reports and instant notification of outages via SMS or email.
The way it works is fairly simple. Once you've signed up, you're prompted to install a script on your web server (they offer it in PHP, JSP, ASP and Perl). The script receives monitoring tasks from the YMU Control Center, and pings other web sites about 10 times per minute. Other web sites in the network will ping your site up to 5 times per minute. If anything is amiss on your site, a text message or email will be dispatched, and you'll also get regular reports about your site's activity over time.
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