Magnify - Push out beautiful website announcements in 10 seconds.
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.
PushPrime - Supercharge your website with push notifications
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Proof - Website conversion rate optimization and visitor monitoring
Better Uptime - We call you when your website goes down