Cachet - Cachet is a free, open source status page for your API, service or company. Built with all of the features that you'd expect from a status page.
Hyperping - Cheap uptime and performance monitoring with detailed reporting and flexible alerting
cState - 🔥 Free & open source under MIT!
Instatus - Quick and beautiful status pages.
Status.io - Status.io is a platform for system status pages and status notifications. Companies rely on Status.io to track outages, schedule planned maintenances, broadcast status notifications, and much more; and their customers love the transparency.
ContainIQ - Kubernetes native monitoring instantly