Parse - Build applications faster with object and file storage, user authentication, push notifications, dashboard and more out of the box.
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.
Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
AnyPresence - AnyPresence is an Enterprise Backend as a Service for mobile app development and API augmentation.
UptimeRobot - Free Website Uptime Monitoring