1. All of your MX record, DNS, blacklist and SMTP diagnostics in one integrated tool.

  2. DownNotifier knows about website availability and provides notification.

  3. Beyond Compare allows you to compare files and folders.

  4. OneAPM Browser Insight is a web performance monitoring platform for statistical analysis of site traffic.

  5. 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.

  6. Uptrends is a website and mobile app that allows you to monitor your website. You can use it to both monitor the security and performance of your website as well as the activity on your site. Read more about Uptrends.

  7. Free open-source website monitoring software, easy to set up and use for monitoring web sites.

  8. FREE monitoring software, website monitoring, application and software monitoring tools. All-in-one FREE monitoring software and tools from Monitor.Us

  9. AppBeat is reliable website monitoring service that alerts you when there is a downtime or failure. It also measures performance and provides functional tests.

  10. WebSite-Watcher detects website updates and highlights all changes in the text. WebSite-Watcher monitors web pages, password protected pages, disucssion forums and much more.

  11. Website uptime monitoring. Be notified by email when your site is down.

  12. Cheap uptime and performance monitoring with detailed reporting and flexible alerting