Melya Framework for Google App Engine (Python)
Documentation can be found here
So you can now build and edit your GAE website from anywhere, and see the changes instantly (without deploying).
Support for multiple domains.
Framework helps you modularize your code.
Edit your site online, but still have your users see the stable version. Push updates to everyone only when you want.
Basic GitHub integration (coming soon). Push and pull changes.
And much more...