Anturis is a monitoring service (SaaS)
for servers, applications, websites, and networks

https://anturis.com/

updown is an online service that checks your website’s status by periodically sending an HTTP request to the URL of your choice. It then notifies you by email or sms when your website is not responding correctly.https://updown.io/

NGINX Amplify is a SaaS‑based monitoring tool for the open source NGINX software and NGINX Plus. With NGINX Amplify you can monitor performance, keep track of infrastructure assets, and improve configuration with static analysis. NGINX Amplify also monitors the underlying OS, application servers (like PHP‑FPM), databases, and other components. NGINX Amplify is simple to set up, yet powerful enough to provide critical insight into NGINX and system performance.

Website Monitoring & Downtime Alerts from StatusCake

Website Uptime & Performance Monitoring

Powerful monitoring tools that are quick-and-easy to set up. Instant alerts that you can trust, the moment your site goes down. Gain invaluable insights into how your website’s performance is impacting your customers’ experiences – helping your business to stay ahead of the competition.

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Statping – Status Page & Monitoring Server

An easy to use Status Page for your websites and applications. Statping will automatically fetch the application and render a beautiful status page with tons of features for you to build an even better status page. This Status Page generator allows you to use MySQL, Postgres, or SQLite on multiple operating systems.

https://github.com/statping/statping