Development tools - plotting

GNUPLOT

Demos show capabilities
http://gnuplot.sourceforge.net/demo_4.4/

Include in C
http://users.aims.ac.za/~kuzamunu/faq/page1.php

Include in C#
http://www.debugging.com/bug/17233

Octave using GNUPLOT
http://www.shogun-toolbox.org/media/images/OctaveDemo.png

MS Chart:

http://archive.msdn.microsoft.com/mschart