D3 (or D3.js) is a JavaScript library for visualizing data using web standards. D3 helps you bring data to life using SVG, Canvas and HTML. D3 combines powerful visualization and interaction techniques with a data-driven approach to DOM manipulation, giving you the full capabilities of modern browsers and the freedom to design the right visual interface for your data.

In their (impressive!) Gallery  I found this one that may be of interest to this community:

Bhaskaran Balakrishnan
Chief, R&D, Congressional Research Service Group
Library of Congress