Hello there,

http://www.djangoproject.com/

The Django project is one of the best frameworks for Python Programming. If you would like to contribute to the visit this link:

http://docs.djangoproject.com/en/dev/internals/contributing/...

This page explains how you can contribute to the project.

You can also contribute to few popular desktop Python programs such as Miro and Blender.

Good luck!

Karl