Dabbler, by Fractal Design, was released as a cut down version of
Fractal Design Painter, and later re-branded as "Art Dabbler" (when Fractal Design
merged with MetaCreations). Dabbler used the brush on canvas metaphor, allowing the artist to
build up density/opacity by repeating strokes over the same part of
the image. Interestingly, it also was capable of using many of the
Adobe defined .8bf plugin filters for special effects.