What are some alternatives?
Google App Engine - A powerful platform to build web and mobile apps that scale automatically.
Dokku - Docker powered mini-Heroku in around 100 lines of Bash
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.
Azure Web Apps - Create and deploy mission critical Web apps that scale with your business
AWS Lambda - Lambda is a cloud service that Amazon Web Services (AWS) provides, which allows developers to run serverless code.
Microsoft Azure - Windows Azure and SQL Azure enable you to build, host and scale applications in Microsoft datacenters.