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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.
UptimeRobot - Free Website Uptime Monitoring
Better Uptime - We call you when your website goes down
Freshping - Application and Data, Monitoring, and Website Monitoring
Uptime.com - Everything you require for unified availability monitoring Simple & intuitive industry leading Enterprise-grade features delivered at a fair price, that are continuously improving.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring