Django release notes are great
https://docs.djangoproject.com/en/3.1/releases/ but I got frustrated that when upgrading multiple versions it was not easy to get a summary of relevant changes as it's one release per page. If upgrading multiple versions that I have to go across multiple pages.
The changelog comparison tool solves that: choose two versions and see all release notes between the two.
It's also used by Django Doctor codebase audit tool to highlight when a given github project is vulnerable to bugs in the Django version being used.
