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.
ClaimCompass - Get paid for delayed or cancelled flights
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Service - Customer service issues solved for you, on demand, for free.
Better Uptime - We call you when your website goes down
AirHelp - Get paid when you're delayed!