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PERL Plot : Plotting program for DSP and Communications. Includes multi-column, scatter,bar,pole-zero,eye diagrams, log-log, polar , polar db and other plot types.
JOpenChart is an open source Java library and toolkit for creating different kinds of charts and embedding them into web applications or Swing applications. It further supports interpolating data and plotting mathematical functions etc. pp.
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A python module providing a cross-platform and cross-media drawing toolkit. It handles lines, polygons, curves, figures, and text--powerful enough for professional plotting--including support for wxWindows, Tk, Quickdraw, PDF, Postscript, and PIL.