WebObjects/Project WONDER/Frameworks/ERPlot
Anjo Krank:
Simple wrapper around the JFreechart framework, which can be found here:
http://www.jfree.org/jfreechart/
JFreechart is a very comprehensive open-source LGPL charting framework. ERPlot is a light wrapper around some of it's features so they can be used inside WOBuilder and webobjects in general.