Gransk is an open source tool by Petter Christian Bjelland that aims to be a Swiss army knife of document processing and analysis. Its primary objective is to quikly provide users with insight to their documents during investigations. It includes a processing engine written in Python and a web interface. Under the hood it uses Apache Tika for content extraction, Elasticsearch for data indexing, and dfVFS to unpack disk images.
Here is the processing overview:
If you want to learn more about the tool and try it in your digital investigations, go straight to Petter’s GitHub.