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;
Other features offered by JFreeChart:

* complete source code is included, under the terms of the GNU Lesser General Public Licence;
* access to data from any source via dataset interfaces;
* support for multiple secondary axes and datasets;
* tooltips, zooming, printing;
* direct export to PNG and JPEG;
* export to PDF via iText and SVG via Batik (both described in the JFreeChart Developer Guide).
* support for servlets, JSP (thanks to Cewolf), applets or client applications;
* comprehensive Javadocs;