Google App Engine

Heroku is a cloud application platform for Ruby, Rails, Node.js, Java, Python, Scala and Clojure web apps.

Apprenda is an Open Platform as a Service (PaaS) stack that enables any organization to transform their existing infrastructure into a self-service cloud application platform.

Simple PaaS for Java, Node, .Net, Ruby, PHP, MySQL, Mongo, PostgreSQL, and more. Freedom to move between IaaS at will with the easiest pricing in the cloud.

Ninefold is a PaaS and IaaS cloud provider with servers in the US and Asia-Pacific. Ninefold’s platform supports Ruby on Rails and Postgres. Ninefold’s infrastructure provides Linux and Windows servers. …

OpenStack OpenStack is a global collaboration of developers and cloud computing technologists producing the ubiquitous open source cloud computing platform for public and private clouds. The project aims to...

Shelly Cloud is a platform for hosting Ruby applications with git-based deployments, easy scaling, automated free backups and local file storage.

Windows Azure and SQL Azure enable you to build, host and scale applications in Microsoft datacenters.

Nodester is a Node.JS Open Source Hosting Platform! Deploy your Node.JS applications on Nodester for FREE or deploy it to your own cloud instance on Amazon EC2, Rackspace, or GoGrid! …

A Joyent Cloud provided free development sandbox for users of Node.js. Use the only field-proven, carrier-grade cloud infrastructure platform.

Virtual Server Hosting for Web Applications

Apache's CloudStack is a Project backed by Citrix and designed to be a direct competitor to OpenStack. It is designed to deploy and manage large networks of virtual machines, as …