PeoplesGeek

Monitoring services like www.siteuptime.com or www.montastic.com require a page on your website to monitor.
This plugin provides a virtual target for your monitoring services that does not invoke other plugins (specifically avoiding the Google analytics plugins so that your statistics are not skewed by monitoring calls) 
The two targets provided for the monitoring service are:
<ul>
<li>monitor.htm – via .htaccess and does not use WordPress (but does use PHP)</li>
<li>monitorWP.htm – via WP and so tests the Database etc is working</li>
</ul>

PG Monitor

A virtual target file to be read by monitoring services instead of using a static HTML page.

Beherit

A simple widget that shows the status of the monitored services in the Uptime Robot service. You only need to enter your Uptime Robot API key and add widget to website.

Uptime Robot Widget

A simple widget that shows the status of the monitored services in the Uptime Robot service.

PG Monitor vs Uptime Robot Widget