How to use Cassandra in Django framework
http://github.com/twissandra/twissandra is a django app with a Cassandra backend. It uses https://github.com/datastax/python-driver to talk to Cassandra.
There is new Cassandra engine (based on cqlengine) for Django - https://github.com/r4fek/django-cassandra-engine
I haven't tried it out for myself, but this looks like something: http://github.com/dziegler/alexandra
There now is a prototype Cassandra backend for Django available here: http://github.com/vaterlaus/django_cassandra_backend