Overview is a tool for analyzing large sets of documents. In includes a sophisticated search engine, word clouds, entity detection, and topic-based document clustering. If that’s not good enough, you can write your own plugins using the API. It is open source and you can run it on your own computer.
It was originally designed for investigative journalists, but it’s now also used for qualitative research, social media conversation analysis, legal document review, digital humanities, and more.
Overview is built to do several types of tasks:
Find specific things using search, visualizations, entity detection, etc.
Exhaustive reading, tagging, and metadata entry or review.
Convert bulk documents between formats, export only a subset, etc.