Making a visible presentation of numerical data, particularly a graphical one. This might include anything from a simple X-Y graph of one dependent variable against one independent variable to a virtual reality which allows you to fly around the data.

gnuplot is the free software foundation's utility for producing various kinds of graphs.

usenet newsgroup: news:comp.graphics.

The computer graphics resource listing contains pointers to several visualisation tools.

comp.graphics faq.

electronic visualization laboratory, university of illinois at chicago.