Jfreechart is a free java class library for generating charts, including:
* pie charts (2d and 3d)
* bar charts (regular and stacked, with an optional 3d effect)
* line and area charts
* scatter plots and bubble charts
* time series, high/low/open/close charts and candle stick charts
* combination charts
* pareto charts
* gantt charts
* wind plots, meter charts and symbol charts
* wafer map charts