Pivotal Web Services (PWS) vs. AppScale vs. Aerobatic

Pivotal Web Services is a public cloud version of the widely supported Open Source Cloud Foundry PaaS. PWS makes is an ideal platform for the rapid deployment, easy scaling and binding of third party apps for Java, PHP, Ruby, GO and Python apps. Focus on apps not dev ops.

AppScale is a platform that allows users to deploy applications developed using the Google App Engine APIs over Amazon EC2, Rackspace, Google Compute Engine, Eucalyptus, Openstack, CloudStack, as well as KVM and VirtualBox.

In a nutshell, it's a platform as a service (PaaS) for HTML5 web apps. You could think of it as Heroku for the front-end. It provides a streamlined developer workflow and a suite of cloud-based smart hosting modules that are highly complementary to your custom app code running in the browser.