ckan
CKAN is an open-source DMS (data management system) for powering data hubs and data portals.
Project Source: https://github.com/ckan/ckan
Project Homepage: http://ckan.org/

django-cms
Open source enterprise content management system based on the django framework.
Project Source: https://github.com/divio/django-cms
Project Homepage: https://www.django-cms.org/en/

django-blog-zinnia
Simple yet powerful and really extendable application for managing a blog within your Django Web site.
Project Source: https://github.com/Fantomas42/django-blog-zinnia

feincms
A Django-based CMS with a focus on extensibility and concise code.
Project Source: https://github.com/feincms/feincms
Project Homepage: http://www.feincms.org/

june
June is a forum.
Project Source: https://github.com/pythoncn/june

Letterpress
A minimal, Markdown based blogging system written in Python.
Project Source: https://github.com/an0/Letterpress
Project Homepage: http://wangling.me/2013/01/letterpress.html

mezzanine
Mezzanine is a powerful, consistent, and flexible content management platform.
Project Source: https://github.com/stephenmcd/mezzanine
Project Homepage: http://mezzanine.jupo.org/

v2ex
Project Babel 2 is an open source software package for creating and supporting communities.
Project Source: https://github.com/livid/v2ex

wagtail
A new Django content management system
Project Source: https://github.com/torchbox/wagtail
Project Homepage: http://wagtail.io/