KMatPlot

KMatplot is a gnuplot-like tool for plotting data sets in either two or three dimensions. It can plot many types of 2d plots, including pixmaps and contours, and 3d surfaces. It offers a full WYSIWYG mode with multiple objects on a single page. As opposite to Gnuplot, KMatplot is very clickable, so easier to use for unexperienced users. It can be used instead of Gnuplot with Octave and Scilab – there are new dll functions installed in those packages, which communicate with KMatplot through an Unix socket. Those functions are named ‘kplot’, ‘kimage’, kmesh’, … and are similar to those found in Octave by default.
Find KMatPlot at: http://kmatplot.sourceforge.net