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Gnuplot is a portable command-line driven graphing utility for Linux, OS/2, MS Windows, OSX, VMS, and many other platforms. The source code is copyrighted but freely distributed (i.e., you don't have to pay for it). It was originally created to allow scientists and students to visualize mathematical functions and data interactively, but has grown to support many non-interactive uses such as web scripting. It is also used as a plotting engine by third-party applications like Octave. Gnuplot has been supported and under active development since 1986. Gnuplot supports many different types of 2D and 3D plots Here is a   Gallery of demos. Gnuplot supports many different types of output interactive screen display:   cross-platform (Qt, wxWidgets, x11) or system-specific (MS Windows, OS/2) direct output to file:   postscript (including eps), pdf, png, gif, jpeg, LaTeX, metafont, emf, svg, ... mouseable web display formats:   HTML5, svg Version 4.6 Release Download from SourceForge Release Notes User Manual (PDF) version 4.6 demo gallery Version 5.0 Release Download from SourceForge Release Notes User Manual (PDF) version 5.0 demo gallery contributed executables for OSX The Development version is gnuplot 5.1
New features are being added regularly. You are welcome to build gnuplot from the CVS source code. Instructions here. More instructions here. Version 5.1 Documentation (PDF) Version 5.1 demo gallery Release History gnuplot 5.0 January 2015 
gnuplot 5.0.3 (latest) February 2016 gnuplot 4.6 March 2012 
gnuplot 4.6.6 (final) September 2014 gnuplot 4.4 March 2010 gnuplot 4.2 April 2007 gnuplot 4.0 April 2004 Copyright/licensing Gnuplot's  copyright     Gnuplot in Action
Second Edition
by Philipp K. Janert
 
Updated for gnuplot 5
Manning Publications (2016)
ISBN: 1633430189
ISBN-13: 9781633430181
  gnuplot Cookbook
by Lee Phillips
 
Packt Publishing (2012)
ISBN : 184951724X
ISBN-13 : 9781849517249
April 2016

from: http://www.gnuplot.info/