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OnlineOrNot - Uptime monitoring for software teams (even teams of one).
Statsignal - Statsignal is a simple and cost-effective way to monitor your website or server and publish a status page of your system.
Uptime Kuma - A fancy self-hosted monitoring tool.
Site monitoring - Free open-source website monitoring software, easy to set up and use for monitoring web sites.
MxToolBox - All of your MX record, DNS, blacklist and SMTP diagnostics in one integrated tool.
UpTower - UpTower is an easy-use tool for website monitoring. UpTower checks websites in 1-minute intervals and notifies user via push notifications about every outage immediately. Using UpTower app user can monitor websites and their availability for free.