The article entitled "Fazendo Arte Com O Pingüim," or "Making Art With The Penguin," reviewed a number of applications, including POV-Ray, The Gimp, ImageMagick, Sodipodi, Sketch and Tux Paint.
Daniel José Viana was kind enough to e-mail scans of the article:
Did you know? Tux Paint is not shareware, it's open source. So it's free, forever!