1. Dashboard with 50 Monitors, Checked Every 5 Minutes, Totally Free. Monitor HTTP(S), Ping, Port and check Keywords. Get alerted via e-mail, SMS, Twitter, web-hooks or push. View uptime, downtime and response times.
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  2. Better Uptime calls the right person on your team when your site goes down. Schedule on-call duties, get helpful alerts, and collaborate on solving incidents faster than ever.
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  3. Pingdom web site monitoring and other infrastructure for you and instantly let you know when anything goes wrong. Measure uptime, downtime, and the performance of your website as experienced by visitors.
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  4. Reliable Website uptime Monitoring , Performance monitoring & Status pages Monitor 50 URLs • 1-minute interval • 10 Global locations • 5 Public status pages.
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  5. PHP Server Monitor is a script that checks whether your websites and servers are up and running. It comes with a web based user interface where you can manage your services and websites, and you can manage users for each server with a mobile number and email address.
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  6. An easy way to check whether a website is down for everybody, or just your own computer.
  7. Cabot is a free, open-source, self-hosted infrastructure monitoring platform that provides some of the best features of PagerDuty, Server Density, Pingdom and Nagios without their cost and complexity.
  8. StatusCake.com is a free website monitoring tool which allows users to track up to 10 websites and get alerted when their site is down or is having trouble. Downtime root cause analysis is included in the free plan to help users diagnose and fix issues.
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  9. Checkmk is a monitoring tool of servers, applications, networks, cloud, containers, storage, databases, IoT and more. Checkmk is available as Raw Edition, which is 100% pure open source, and as Enterprise Edition with a lot of additional features.
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    • Software as a Service (SaaS)
    Pinger is an uptime monitoring service which checks that your site is up and running and notifies you when it's not. It has contemporary UI and pleasant look along with a lot of useful features like notifying you via Slack, Telegram, Email or SMS.
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  10. Pinpoint and solve performance issues in your Ruby, Java, .NET, PHP and Python apps with real user, application and server monitoring. Free accounts can ping a website every 1 minute, from multiple locations around the globe, and send email alerts.
  11. Ping Tracer continuously pings each network host between your computer and a given destination, helping visually identify the source of connectivity problems.
  12. Website/Server monitoring with fast notification via Web, SLACK or E-Mail on issues. What you get: 25 monitors, checked every 15 minutes. Now includes SSL-Certificate validation and port checks. Totally free!.
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  13. === Free Uptime Monitoring === Minimize your downtime by being the first to know about it! Start off with 15 Uptime Monitors, checked every 1 minute, from around the world, completely FREE forever.
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  14. Track web page changes and get notified. Free Sign-up. Have all data in one place