Tau - Graph creating program designed to give publication-quality results first time around. - http://www.soc.soton.ac.uk/JRD/PROC/people/pki/soft.html
Chris Johnson's Graphing - GraphDraw, Multiplot, ChartDraw, FNPlotter, Surface, 3DFNedit and Textdraw graphic representation software. - http://www.bulldog.u-net.com/software/graph.html