Check Website is a performance monitoring and uptime notification tool. This script is very easy to setup and use. Script will check if your website is up, and will also check the response time of the site. 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 to a daily log file. You can check as many websites as you wish, all URL's are stored in a separate text file for easy updating. Check Website is open-source and released as GPL.