Voir aussi :

• Outils de documentation qui contient des logiciels de dessin orientés Diagram (UML, Network, Flow, Chart, …]]
• GUI/IHM prototyping

Dessin vectoriel, vector-based graphic design, Gratuit.

http://www.creativedocs.net/samples/

Inkscape is an Open Source vector graphics editor, Gratuit et Open source.

http://inkscape.org

some screenshots

http://www.getpaint.net

http://tuxpaint.org/, http://sourceforge.net/projects/tuxpaint/