data visualisation

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prefuse | interactive information visualization toolkit

http://prefuse.org/ Prefuse is a set of software tools for creating rich interactive data visualizations.
http://mbostock.github.com/d3/

d3.js

D3 allows you to bind arbitrary data to a Document Object Model (DOM), and then apply data-driven transformations to the document. As a trivial example, you can use D3 to generate a basic HTML table from an array of numbers. Or, use the same data to create an interactive SVG bar chart with smooth transitions and interaction. D3 is not a traditional visualization framework.