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UptimeRobot - Free Website Uptime Monitoring
Whoisology - Connected database of whois records and whois history
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.
Bulk Whois API - Bulk Whois API is a provider of parsed WHOIS data in JSON with simple API, competitive pricing, top notch support, and more.
Uptime Kuma - A fancy self-hosted monitoring tool.
WhoisThisDomain - Domain name lookup tool that allows you to get information about domain registration from WHOIS server.