Metapost: http://cm.bell-labs.com/who/hobby/MetaPost.html Examples: http://tex.loria.fr/prod-graph/zoonekynd/metapost/metapost.html ImageMagick: http://www.imagemagick.org/script/index.php Metapost presupposes you know TeX/LaTeX. If you need help in converting metapost output to eps or pdf, let me know. Walter Kehowski