Google App Engine - A powerful platform to build web and mobile apps that scale automatically.
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.
Amazon EC2 - Amazon Web Services offers reliable, scalable, and inexpensive cloud computing services. Free to join, pay only for what you use.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Kubernetes - Kubernetes is an open source orchestration system for Docker containers
Better Uptime - We call you when your website goes down