Stashboard - Stashboard is a status dashboard for APIs and software services.
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.
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.
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.