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Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
Better Uptime - We call you when your website goes down
UptimeRobot - Free Website Uptime Monitoring
Freshping - Application and Data, Monitoring, and Website Monitoring
UpTime.onl - Simple website uptime monitoring tool
cState - 🔥 Free & open source under MIT!