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JFreeChart is a free Java chart library with support for bar charts, line charts, pie charts, scatter plots, candlestick charts, high-low-open-close, combined charts and more. Includes log axes, zooming, mouse events, tooltips, and export to PNG/JPEG/PDF/SVG. You can use JFreeChart in applications, servlets, JSP and applets. Full source code is included free, subject to the terms of the GNU LGPL.