Favourite Open Source Google App Engine apps (Java or Python)

Question

To learn from good examples, what are the best open source Google App Engine applications out there?

I don't care if it is Java or Python based.

Please one app per answer. Feel free to add a link to the live app (if there is) and to the project page.

Answer 1

Rietveld of course

Answer 2

Partychapp is a Java GAE app using the XMPP services to allow users to create and join chatrooms together.

Answer 3

JaikuEngine is probably Google's biggest open source App Engine project.

Answer 4

I really like Bloog, a simple blogging application. Source is on github.

Answer 5

I really like FoFou which is a simple forum software that I have used.

FoFou is open source and hosted on github.

Answer 6

OpenShare (http://openshare.emotionull.com)

http://bitbucket.org/jonromero/openshare/src/

Answer 7

I use simple of use and similar with Django framework AppEngine framework.

I think, than you can use this framework for your web sites by using already existing applications and make you own applications.

Answer 8

StackPrinter is a webapp that allows printing of StackOverflow's questions in a Printer-Friendly way.
Source code is on github.

Answer 9

Eezee MVC is An Easy Model, View, Controller Framework for Google App Engine.
Features

Has a Controller Class that does routing, handling and rendering templates.

Your controllers reside in the controllers folder, views (html Django templates) in views folder, models in models folder.

Allows Controller to recieve GET/POST parameters as function arguments.