Viégas and Wattenberg – Word Tree
A word tree is a visual search tool for unstructured text, such as a book, article, speech or poem. It lets you pick a word or phrase and shows you all the different contexts in which it appears. The contexts are arranged in a tree-like branching structure to reveal recurrent themes and phrases.
Fernanda Viégas and Martin Wattenberg word tree information: http://hint.fm/projects/wordtree/
Software engineer Jason Davies created a browser based interactive version of word tree: https://www.jasondavies.com/wordtree/