Most webmasters use “free” website monitoring services to track the downtime and uptime of their sites. These free service normally offer one domain monitoring service and often required to upgrade to the premium version for unlimited domain monitoring. Some feature like email or SMS alerts require premium version. Now, via Google Drive Spreadsheet, you can monitor the status your websites freely with out paying for any commercial services. You can track and monitor unlimited number of websites and get alerts from email or SMS. This Google Scripts based website monitoring tool is absolutely FREE as well. The setup only takes free minute. After you configured, Google Drive will monitor the uptime /downtime of your website(s) continuously and automatically.