There are very few tools needed to make use of the examples and code in this book. You'll need to install node.js (http://node.org) which is covered in Chapter 5, Twitter. You'll want to download d3.js (http://d3js.org), jQuery (http://jquery.com), and Raphael.js (http://raphaeljs.com/). All the demos can be viewed in any modern web browser. The code has been tested against Chrome but should work on FireFox, Opera, and even Internet Explorer.