How to create the tree graphs of Mind42.com?

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What graphics libraries exist, if any, for programming tree graphs like that of Mind42.com? Ruby is preferred but Java could work also via calls via JRuby.

Here's a screen-cap for convenience: http://i43.tinypic.com/9levs1.jpg

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The graph editor yEd can make very similar things, so I assume it's possible to use the yFiles library (Java, .NET, Flash) it's based on to create such trees.

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