Google App Engine - A powerful platform to build web and mobile apps that scale automatically.
Protonet - Private cloud servers - Slack meets Dropbox in a box
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.
Duple - Create your own private cloud at home
Salesforce Platform - Salesforce Platform is a comprehensive PaaS solution that paves the way for the developers to test, build, and mitigate the issues in the cloud application before the final deployment.
Convox - A year ago, I described a strategy we use to build Convox: Integration over Invention. This philosophy leads us to build a platform that integrates existing cloud services instead of building custom software.