Free Website Monitoring
Script will check if your website is up, and check the response time of the site also. A performance monitoring and up time notification tool. You can then choose to receive an email notification if the site is down, or if the site response time is too high. All results are also written daily to a log file. You can check as many websites as you wish, all URLs are stored in a separate text file for easy updating. Web Site Monitoring - Performance Monitoring is open-source and released under the GPL license. Runs on any OS that supports Perl.