GraphViz

GraphViz provides a collection of tools for manipulating graph structures and generating graph layouts.

• http://www.graphviz.org/ - main page
• http://www.research.att.com/sw/tools/graphviz/examples/ - example gallery
• http://www.graphviz.org/Resources.php - impressive list of visualization tools that use graphviz
• WebDot - cgi for turning dot files into graphs

• UnixGeekTools - other great tools for unix geeks
• DataVisualization

Os X

• http://www.pixelglow.com/graphviz/download/ - an OSX gui for graphviz
• also interesting - omni graffle (came free on my 2 yr old 12" powerbook) will open .dot files :)

Gui

    digraph G {
      "a" -> "b" [color="blue"];
      "b" -> "c" [color="red"];
      "c" -> "d" [color="red"];
      "d" -> "a" [color="red"];
    }

    dot -Tgif basic.dot > basic.dot.gif