I'm a lawyer. I found myself writing a lot of legal briefs—but didn't like the Bluebooking and cite-checking part (it's kind of like linting code, but for lawyers and their briefs). So, I used Django to create http://www.cite.ly, which automates the process of checking legal writing for Bluebooking errors and misquotations of case law through a web app.

We turned a 5- to 10-hour process into one that takes 10 minutes!

The app itself is in private beta at this point. We also rely on the software internally while externally offering a service where lawyers send us their briefs and we show them the errors that the software finds :)