Perl interface to the GraphViz graphing tool

 This module provides an interface to layout and image generation of
 directed and undirected graphs in a variety of formats (PostScript,
 PNG, etc.) using the "dot", "neato", "twopi", "circo" and "fdp"
 programs from the GraphViz project (http://www.graphviz.org/ or
 http://www.research.att.com/sw/tools/graphviz/).