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Graphviz (also known as dotty) is a command line tool which takes a simple textual description of a graph and calculates the layout, which can be saved in many different formats (pdf, ps, png, …).

So basically it is GnuPlot for graphs (and trees).

A Mac version with a GUI is available from PixelGlow

The source code is available from AT&T: [] and []

I just saw that the Graph Template Library is available for Panther as well. []