See also DebianScienceGnuplot.

Gnuplot -- Web: http://www.gnuplot.info/

Description

   A command-line driven interactive plotting program, in 2D and 3D.

Presentation in French :

http://logiciels-libres-cndp.ac-versailles.fr/article.php3?id_article=70&var_recherche=gnuplot

.