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.

LambStatus - Serverless status page system which enables you to build a status page with minimum effort and cost!

cState - 🔥 Free & open source under MIT!

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.

Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.

StatusPage.io - StatusPage.io is the best way for web infrastructure, developer API, and SaaS companies to get set up with their very own status page in minutes. Integrate public metrics and allow your customers to subscribe to be updated automatically.