Minima is a solid document chat tool that lets you interrogate your local files using ChatGPT or Claude. It's particularly useful for businesses with lots of internal documents, PDFs, or knowledge bases that need to be searchable and queryable in natural language.
The setup requires some technical know-how since you're running it locally and need to configure API connections, but once it's working, it can be quite powerful for document-heavy workflows. The project appears actively maintained with a growing community, though it's still relatively young in terms of maturity.