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UptimeRobot - Free Website Uptime Monitoring
Is It Down Right Now? - Network & Admin
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.
Is it Down? - Is it down can check if a website is down or is it just your PC that can not access it.
Pingbreak - Pingbreak is an original and free monitoring service.
DownDetector - A simple service to tell you whether a website is down.