Google App Engine - A powerful platform to build web and mobile apps that scale automatically.
Pivotal - Pivotal Software provides enterprise PaaS-based solutions.
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.
Apprenda - Apprenda is a software layer that transforms any infrastructure into a policy-driven, hybrid cloud application platform.
DigitalOcean - Simplifying cloud hosting. Deploy an SSD cloud server in 55 seconds.