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.
Cachet is a simple to use and easy to manage status page system and can be easily installed and used to track third party service letting your users know what's going on.
The project seems abandoned, and no active forks exist as far as I can see. E.g. https://github.com/CachetHQ/Cachet/issues/4314
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.
Free & open source under MIT! Über fast, backwards compatible (IE8+), tiny, and simple status page built with Hugo. Compatible with Netlify & GitHub Pages. https://github.com/mistermantas/cstate.
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!.
Dead Simple Uptime Monitoring.Discontinued
https://amixr.io/Company sold to Grafana and product shelved.
Netthrob runs automated verification checks on your website every three minutes from five different geographies and immediately informs you through Phone, SMS & Email when your site goes down.
Statusfy is a Status Page System, completely Open Source, easy to use and deploy to a variety of hosting services. The goal behind is to lower costs and complexity providing a simpler and versatile Open Source alternative.
The project is no longer maintained: https://github.com/juliomrqz/statusfy/discussions/826
RapidSpike is a Digital Experience Monitoring Platform that interacts with your online platforms exactly as your customers do. It collects data across your digital ecosystem to help you improve a fast, reliable digital customer experience.