What are some alternatives?
When comparing Umbler 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.
Google App Engine - A powerful platform to build web and mobile apps that scale automatically.
Microsoft Azure - Windows Azure and SQL Azure enable you to build, host and scale applications in Microsoft datacenters.
DigitalOcean - Simplifying cloud hosting. Deploy an SSD cloud server in 55 seconds.
Vultr - VULTR Global Cloud Hosting - Brilliantly Fast SSD VPS Cloud Servers. 100% KVM Virtualization
Dokku - Docker powered mini-Heroku in around 100 lines of Bash