Attached Link: http://www.gimp.org

or, maybe the Gimp - the poor man's Photoshop (free). Tried some of the standard cartoon filters in it, not sure if it's what you're looking for, but if you can't afford Photoshop, it's a good thing to have...

I wish I'd said that.. The Staircase Wit

anahl nathrak uth vas betude doth yel dyenvey..;)