JFreeChart is a free chart library for Java that can generate a wide variety of charts for use in applications, applets and servlets.

See:
Description

Packages

org.jfree.chart	Core classes, including JFreeChart and ChartPanel.
org.jfree.chart.annotations	A framework for addings annotations to charts.
org.jfree.chart.axis	Axis classes and interfaces.
org.jfree.chart.block	Blocks and layout classes used extensively by the LegendTitle class.
org.jfree.chart.demo	Some basic demos to get you started.
org.jfree.chart.editor	Provides a simple (but so far incomplete) framework for editing chart properties.
org.jfree.chart.encoders	Classes related to the encoding of charts to different image formats.
org.jfree.chart.entity	Classes representing components of (or entities in) a chart.
org.jfree.chart.event	Event classes and listener interfaces, used to provide a change notification mechanism so that charts are automatically redrawn whenever changes are made to any chart component.
org.jfree.chart.imagemap	Classes, including ImageMapUtilities, for creating HTML image maps.
org.jfree.chart.labels	Generators and other classes used for the display of item labels and tooltips.
org.jfree.chart.needle	A range of objects that can be used to represent the needle on a CompassPlot.
org.jfree.chart.panel	Classes related to the ChartPanel class.
org.jfree.chart.plot	Plot classes and related interfaces.
org.jfree.chart.plot.dial	Classes for creating dial plots.
org.jfree.chart.renderer	Core support for the plug-in renderers used by the CategoryPlot and XYPlot classes.
org.jfree.chart.renderer.category	Plug-in renderers for the CategoryPlot class.
org.jfree.chart.renderer.xy	Plug-in renderers for the XYPlot class.
org.jfree.chart.resources	Localised resources for the JFreeChart class library.
org.jfree.chart.servlet	Classes for providing useful servlet and JSP functionality.
org.jfree.chart.title	Classes used to display chart titles and subtitles.
org.jfree.chart.urls	Classes for adding URLS to charts for HTML image map generation.
org.jfree.chart.util	Utility classes used by JFreeChart.
org.jfree.data	The base package for classes that represent various types of data.
org.jfree.data.category	A package containing the CategoryDataset interface and related classes.
org.jfree.data.contour	Datasets used by the ContourPlot class.
org.jfree.data.function	Representation for simple functions.
org.jfree.data.gantt	Data interfaces and classes for Gantt charts.
org.jfree.data.general	Data interfaces and classes.
org.jfree.data.io	Miscellaneous support for input/output of data.
org.jfree.data.jdbc	Dataset classes that fetch data from a database via JDBC.
org.jfree.data.resources	Resource bundles for items that require localisation.
org.jfree.data.statistics	Classes for representing statistical data.
org.jfree.data.time	Interfaces and classes for time-related data.
org.jfree.data.time.ohlc	Classes for representing financial data in open-high-low-close form.
org.jfree.data.xml	Support for reading datasets from XML files.
org.jfree.data.xy	A package containing the XYDataset interface and related classes.

JFreeChart is a free chart library for Java that can generate a wide variety of charts for use in applications, applets and servlets.

Please visit http://www.jfree.org/jfreechart/index.html for the latest information about JFreeChart.