Simple Website Monitoring

How do you easily track the availability of a handful of websites? I have a few personal resource websites hosted in my basement. And a few others out on the web. My aDSL modem had started to intermittently go offline. Since I was not monitoring it, I was unsure how often this was happening. Once every few weeks in the winter could just be due to local power failures in the neighbourhood. Or may the modem was really dying a slow death? What was the uptime of my cloud based sites? I was embarrassed since I could not quickly answer these qiuestions...

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