WebGazer is an uptime monitoring platform that checks if your website is up as it should be and notifies you if anything goes wrong
StatusPage Generator - Host your status page on GitHub
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StatusPage.io - StatusPage.io is the best way for web infrastructure, developer API, and SaaS companies to get set up with their very own status page in minutes. Integrate public metrics and allow your customers to subscribe to be updated automatically.
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.