Django-Neon is a CMS-Applikation for Django. It is not a system ready to run out of the box but an application to integrate into a django-project.
Django-Neon avoids rich text editors but makes use of markup like reStructuredText and Markdown . Also django-neon comes with an integrated media-database and markup-extensions to include media-contents simply by using a special markup-syntax.
The source-code is available at bitbucket, also there is a dedicted page for www.django-neon.com with detailed documentation and a tutorial.