Tux Paint includes a number of 'filters' and 'special effects' which can be applied to a drawing, such as blurring, fading, and making the picture look as though it was drawn in chalk on pavement.
Gaussian units | Motion blur | Gaussian measure | Gaussian function | Gaussian random field | Gaussian blur | motion blur | Gaussian integer | Gaussian Elimination | Gaussian elimination | Blur Studio |
GIMP implements a bilateral filter in its Filters-->Blur tools; and it is called Selective Gaussian Blur.