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Graphviz 1.12 (v11) won Best Mac OS X Open Source Product and was runner-up in Best Product to Mac OS X in the 2004 Apple Design Awards. With AT&T Graphviz, you don’t figure out the graph, the program does. Using a simple file format called dot, just describe which nodes should connect to which other nodes. Then the sophisticated layout routines quickly render it into many different output formats.