Sane single table model inheritance for Django
Django fieldsignals simply makes it easy to tell when the fields on your model have changed.
Generic Relations for Django Rest Framework
Utilities for implementing Modified Preorder Tree Traversal with your Django Models and working with trees of Model instances.
Basic site-wide announcements for your Django project.
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Simplified port of GVM for python. See http://www.tomgibara.com/clustering/fast-spatial/java-library for the original.