Java library for displaying plots (graphs, diagrams, and charts)

 GRAL is a free Java library for displaying plots (graphs, diagrams, and
 charts). The acronym GRAL simply stands for GRAphing Library.
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 Features
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  * Ready-to-use classes for data management
  * Data processing and filtering (smoothing, rescaling, statistics, histograms)
  * Many different plot types: xy/scatter plot, bubble plot, line plot,
    area plot, bar plot, pie plot, donut plot, box-and-whisker plot, raster plot
  * Legends: horizontal and vertical
  * Various axis types: linear axes, logarithmic axes, arbitrary number of axes
  * Several file formats are supported as data sources or data sinks (CSV,
    bitmap image data, audio file data)
  * Exporting plots in bitmap and vector file formats (PNG, GIF, JPEG, EPS, PDF,
    SVG)
  * Small footprint (about 300 kilobytes)