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Neal Tuckerleft a comment
One of the easiest tools to set up and use I've ever found. It's great for having quick and seamless access to the uptime of all my different sites. Personally, I had looked at a bunch of other tools, but nothing else came close. And it's FREE! Hard to beat that. :)
UptimeRobot App 2.0Web, SSL, ports & Cron-jobs monitoring