Fuse - Fuse is a UX tool suite for mobile app designers and developers.
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.
Siberian CMS - Siberian is an Open-Source and Free App Maker. Unlimited Push Notifications. Unlimited features. Fully Customizable. Download it and build your own app now!
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
GoodBarber - GoodBarber is a mobile app creation platform.
Better Uptime - We call you when your website goes down