Flare is a free, BSD licensed library for displaying information.  While it does require flash on the client side to run, flare widgets can be constructed using the free flex tools from Adobe.

Visualizations Supported:

• Timelines
• Charts (Stacks, XY, Line, Bar, Pie)
• Complex Animations
• Treemaps
• Network Diagrams / Node Graphs

Of particular significance are the libraries ability to provide fish eye views & layout complex node graphs.

Check it out online here:

• Flare Online Demo 
• Tutorial 

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