Here is a GPL program to solve the so-called Pic-a-Pix puzzle, black and
white version (in Italy it is called "puzzle giapponese"), see
the Conceptis - picture
forming logic puzzles site.
It runs in Linux.
A number of tools are also included, including an authomatic information extractor from 'pdf' files that you can find in the internet; for this to work you shall need "pdftops" (part of xpdf) at least version 1, otherwise the 'type 3' fonts will not be recognized.