Package: xfig
In Debian: yes
Web: http://www.xfig.org/
Description
Xfig is the standard program for vector drawing and schemas editing under X11. .fig and .eps file formats offer large compatibilities with TeX.
Links:
Presentation in French: http://logiciels-libres-cndp.ac-versailles.fr/article.php3?id_article=63