Stashboard - Stashboard is a status dashboard for APIs and software services.
LambStatus - Serverless status page system which enables you to build a status page with minimum effort and cost!
StatusCake Pages - Fully featured, great value Status Page.
cState - 🔥 Free & open source under MIT!
KnownOutage - Quickly and easily alert people when there is an issue or outage with your service.
Fyipe - Status page, monitoring and on-call made simple.