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.
Site Down - Site down outage and downtime reports from SiteDown.co
Hosted Status Page - Incident Management with Automated Downtime Detection
Is it Down? - Is it down can check if a website is down or is it just your PC that can not access it.
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.
UPDOWNtoday - UPDOWNTODAY allows you to check whether the website is down or not.