This app implements directed acyclic graphs for Django, with an API that will be very familiar to people who’ve used Gustavo Picon’s efficient tree implementations in django-treebeard before.
Works for me, but has no unit tests and may not see any improvements from me anytime soon. Just putting it out there in case it might be a useful starting point for somebody else.
django-treebeard-dag comes with a simplified BSD license, a very liberal license. See the included LICENSE file for details.