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.
Owler - Owler is a crowdsourced data model allowing users to follow, track, and research companies.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Whatagraph - Whatagraph is the most visual multi-source marketing reporting platform. Built in collaboration with digital marketing agencies
Better Uptime - We call you when your website goes down
QlikSense - A business discovery platform that delivers self-service business intelligence capabilities