statuspage - A simple self-hosted status page site with an API written in Django under the BSD license.
GitHub Visualizer - Enter user/repo and see the project visually
UptimeRobot - Free Website Uptime Monitoring
Widgetic - An App Store for every platform.
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.
Little Star - Efficiently and easily manage your GitHub stars