Paint by Numbers
blindchicken.com
Offers two color puzzles available to print out or solve online.
Solving Paint-by-Numbers Puzzles with Integer Programming
oberlin.edu
Article and instructions on solving puzzles.
Conceptis Puzzles
conceptispuzzles.com
Creator and supplier of picture-forming logic puzzles. Contains online games and those for sale from Japan.
Nonogram Solver
comp.lancs.ac.uk
Information about Nonogram logic puzzles and how to solve them, plus examples of two on-line solvers, software, and links.