Djangotoolbox provides a common API for running Django on non-relational/NoSQL databases (currently via Django-nonrel).
In djangotoolbox.db you can find base classes for writing non-relational DB backends. Read Writing a non-relational Django backend for more information.
In djangotoolbox.fields you can find several common field types for non-relational DB backends (ListField, SetField, DictField, RawField, BlobField).
The djangotoolbox.admin module provides admin overrides for making django.contrib.auth work correctly in the admin UI. Simply add 'djangotoolbox' to INSTALLED_APPS after django.contrib.admin. This will disable features that require JOINs. If you still need permission handling you should use the nonrel permission backend.