Graph Maven Plugin
This plugin creates customizable dependency graphs for Maven projects using Graphviz.
For example, this is a graph of the logging libraries used by this plugin:
The Graphviz "dot" executable needs to be installed and in your path for the plugin to produce graphs
There are free, stable, and mature, executables for Linux, Mac, Solaris, and Windows at http://www.graphviz.org/
See http://site.kuali.org/maven/plugins/graph-maven-plugin/1.2.3/ for documentation and example graphs