The googleappengine code provides necessary extensions and adjustments to TiddlyWeb to make it work on Google App Engine. This is a quite exciting but rather advanced collection of code (compared to some of the other plugins) that requires a fair amount of work for someone to use. The included README file may help.

The code can be found at github.

A running version of this code can be found at http://tiddlyweb.appspot.com/ and http://tiddlywebwiki.appspot.com/

A blog post describes how to set it up.