Download Gnuplot 
Gnuplot is a portable command-line driven graphing 
utility for Windows, Linux, OS/2,  OSX, VMS, and many 
other platforms.  Gnuplot is able to generate both 2D and 3D plots; 
delivering the results in animated views. You can also save 
the graphs to a variety of image formats, including PNG, 
SVG, JPEG and EPS. Supported outputs include:
 
- 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..
 
- Web display formats: HTML5, svg.
 
 
Gnuplot was originally created to allow 
scientists and students to visualize mathematical functions 
and data interactively, but it has grown to support many 
non-interactive uses such as web scripting. It is also used 
as a plotting engine by third-party applications such as 
Octave.  
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