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UptimeRobot - Free Website Uptime Monitoring
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.
WebGazer - Monitor your website's availability with WebGazer, review its performance and get instant notifications when your website goes down. No installation required and free plan available.
Better Uptime - We call you when your website goes down
Hyperping - Cheap uptime and performance monitoring with detailed reporting and flexible alerting
Freshping - Application and Data, Monitoring, and Website Monitoring