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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.
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RapidSpike - RapidSpike is an uptime and performance monitoring service for websites and web applications.
Downtime Monkey - Downtime Monkey: website downtime alerts & uptime monitoring worldwide.
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.