Get the full power and scalability of MongoDB – whether using your existing database or starting from scratch. Retain direct access to the database; safely expose existing data to new applications.
Google App Engine - A powerful platform to build web and mobile apps that scale automatically.
Parse (Updated) - Parse with five new products, live from F8
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 Mobile Apps - Build engaging cross-platform and native apps for iOS, Android, Windows or Mac with Azure's Mobile App Service.
Microsoft Azure - Windows Azure and SQL Azure enable you to build, host and scale applications in Microsoft datacenters.