What are some alternatives?
When comparing Google App Engine and OpenShift, you can also consider the following products
Heroku - Agile deployment platform for Ruby, Node.js, Clojure, Java, Python, and Scala. Setup takes only minutes and deploys are instant through git. Leave tedious server maintenance to Heroku and focus on your code.
Dokku - Docker powered mini-Heroku in around 100 lines of Bash
Microsoft Azure - Windows Azure and SQL Azure enable you to build, host and scale applications in Microsoft datacenters.
AWS Lambda - Lambda is a cloud service that Amazon Web Services (AWS) provides, which allows developers to run serverless code.
Google Cloud Functions - A serverless platform for building event-based microservices.
Azure Web Apps - Create and deploy mission critical Web apps that scale with your business