Word Tree got a refresh by Jason Davies. It works more smoothly and better supports non-English languages. The visualization tool lets you load a body of text and see it as a tree network, which is especially useful for text with recurring patterns or themes.
The original version of this tool, by Martin Wattenberg and Fernanda Viégas, came in 2007 on a data exploration and collaborative analysis site called Many Eyes. It was the best of times for visualization on the internet.
Visualize This: The FlowingData Guide to Design, Visualization, and Statistics (2nd Edition)
