AppFog vs Atlantis: What are the differences?
What is AppFog? Simple PaaS for Java, Python, Node, .Net, Ruby, PHP, MySQL, Mongo, and PostgreSQL. AppFog provides the infrastructure web developers need to build apps without worrying about IT tasks or having to wait days to get servers ready for writing code. AppFog’s web application technologies include PHP, NodeJS, Ruby, Python, Java, .NET, MySQL, and PostgreSQL.
What is Atlantis? Open Source PaaS Built on Docker, by Ooyala. Atlantis is an Open Source PaaS for HTTP applications built on Docker and written in Go. It makes it easy to build and deploy applications in a safe, repeatable fashion, and flexibly route requests to the appropriate containers.
AppFog and Atlantis can be categorized as "Platform as a Service" tools.
Atlantis is an open source tool with 381 GitHub stars and 33 GitHub forks. Here's a link to Atlantis's open source repository on GitHub.