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.
Datadeck - Spreadsheets visualized In two clicks
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Metric.live - Real-time and advanced periodic alerts for Google Analytics.
Better Uptime - We call you when your website goes down
Statsbot - Connect your database, let Statsbot generate data relationships from your database automatically, and get your first insights in a matter of minutes.