Paasmaker is an open source Platform as a Service, designed in the spirit of Google App Engine, CloudFoundry, and some other internal tools I had previously worked with.

Paasmaker is written in Python, and can currently run PHP, Python, Ruby, and Node.js applications. It is being used in production to host the Paasmaker website but is not generally considered stable enough to use in production.

You can check out the code from the BitBucket repository or read the documentation.