What are some alternatives?
When comparing Apache CloudStack and OpenShift, you can also consider the following products
OpenStack - OpenStack software controls large pools of compute, storage, and networking resources throughout a datacenter, managed through a dashboard or via the OpenStack API.
Google App Engine - A powerful platform to build web and mobile apps that scale automatically.
OpenNebula - The Simplest Cloud Management Experience
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.
VMware vCenter - VMware vCenter Server provides a centralized platform for managing your VMware vSphere environments.
Microsoft Azure - Windows Azure and SQL Azure enable you to build, host and scale applications in Microsoft datacenters.