JFreeChart is a free Java class library for generating charts, including:
    * pie charts;
    * 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.

WWW: http://www.jfree.org/jfreechart/index.php