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UptimeRobot - Free Website Uptime Monitoring
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.
RapidSpike - RapidSpike is a reliability, performance and security monitoring service for transactional websites. Using next-generation synthetic monitoring & deeper than ever before data, RapidSpike is for businesses serious about protecting their online revenue
Better Uptime - We call you when your website goes down
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Freshping - Application and Data, Monitoring, and Website Monitoring