Google App Engine - A powerful platform to build web and mobile apps that scale automatically.
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
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.
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
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.
Codeship - Codeship is a fast and secure hosted Continuous Delivery platform that scales with your needs.