GotSiteMonitor.com is described as 'Website Monitoring - Monitor your website uptime and HTTP/FTP/SMTP/POP3 services. Real-time Phone and SMS alerts. Free website monitors available'. There are more than 50 alternatives to GotSiteMonitor.com, not only websites but also apps for a variety of platforms, including SaaS, Windows, Linux and Android. The best alternative is UptimeRobot, which is free. Other great sites and apps similar to GotSiteMonitor.com are Pingdom (Paid), Update Scanner (Free, Open Source), FiveFilters Feed Creator (Freemium) and Feedfry (Freemium).
Dashboard with 50 Monitors, Checked Every 5 Minutes, Totally Free. Monitor HTTP(S), Ping, Port and check Keywords. Get alerted via e-mail, SMS, Twitter, web-hooks or push. View uptime, downtime and response times.
Pingdom web site monitoring and other infrastructure for you and instantly let you know when anything goes wrong. Measure uptime, downtime, and the performance of your website as experienced by visitors.
StatusCake.com is a free website monitoring tool which allows users to track up to 10 websites and get alerted when their site is down or is having trouble. Downtime root cause analysis is included in the free plan to help users diagnose and fix issues.