KnownOutage - Quickly and easily alert people when there is an issue or outage with your service.
statuspage - A simple self-hosted status page site with an API written in Django under the BSD license.
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.
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.
Stashboard - Stashboard is a status dashboard for APIs and software services.
YUNO - YUNO is a web data driven company focussed on solving customer challenges in web data discovery and extraction space.