These sites provide Nonogram helpers in one form or another (binaries or source to download; Java applets). Helpers act like electronic pen and paper, but leave the logical deductions to the human.
 Cross+A.
              Nonograms —
              Shareware solver and
              crossword/anagram helper, from Russia; includes
              coloured puzzles
Cross+A.
              Nonograms —
              Shareware solver and
              crossword/anagram helper, from Russia; includes
              coloured puzzles
              
             Everett Kaser Software
              - Descartes Enigma — A shareware helper
              for Windows (does colours), plus a few hundred
              puzzles
Everett Kaser Software
              - Descartes Enigma — A shareware helper
              for Windows (does colours), plus a few hundred
              puzzles
              
             Goobix.com -
              Nonograms —
              The Nonogram section of a website
              of on-line games, including a Javascipt helper with
              random puzzles — by Vlad
              Dascalu; in Romanian and English
Goobix.com -
              Nonograms —
              The Nonogram section of a website
              of on-line games, including a Javascipt helper with
              random puzzles — by Vlad
              Dascalu; in Romanian and English
              
             Griddlers
              Net —
              “Extended Paint by Numbers online
              puzzles, new puzzles published everyday. Free fun.” —
              Includes colours and isometric puzzles; a community
              of solvers!
Griddlers
              Net —
              “Extended Paint by Numbers online
              puzzles, new puzzles published everyday. Free fun.” —
              Includes colours and isometric puzzles; a community
              of solvers!
              
             Griddlers Solver -
              Editor and advanced auto-solver for favourite
              puzzles. —
              A solver for Windows, by Juraj
              Simlovic
Griddlers Solver -
              Editor and advanced auto-solver for favourite
              puzzles. —
              A solver for Windows, by Juraj
              Simlovic
              
             Hanjie
              — A
              comprehensive site with information, puzzles, and a
              JavaScript helper — yet it somehow manages to avoid
              using the word ‘Nonogram’!
Hanjie
              — A
              comprehensive site with information, puzzles, and a
              JavaScript helper — yet it somehow manages to avoid
              using the word ‘Nonogram’!
              
             Nonogram Problems (Java
              Puzzle) —
              Hirofumi Fujiwara's Java applet
              helper/solver page including some difficult
              puzzles
Nonogram Problems (Java
              Puzzle) —
              Hirofumi Fujiwara's Java applet
              helper/solver page including some difficult
              puzzles
              
             Nonograms - online
              puzzle game —
              A JavaScript game, in English,
              Bulgarian, German and Dutch; includes other similar
              brainteasers
Nonograms - online
              puzzle game —
              A JavaScript game, in English,
              Bulgarian, German and Dutch; includes other similar
              brainteasers
              
             Open Directory - Games: Video
              Games: Puzzle: Nonograms —
Open Directory - Games: Video
              Games: Puzzle: Nonograms — Also called Paint By Numbers Puzzle, Japanese Puzzle or Gridlers. This category contains online and video game versions of nonograms.— from the Open Directory Project (ODP)
 T&O Japanese
              Puzzles - program with lots of nice
              picture-puzzles. — A Windows
              helper/solver; Dutch and English
T&O Japanese
              Puzzles - program with lots of nice
              picture-puzzles. — A Windows
              helper/solver; Dutch and English
              
             World of CryptoPics -
              The ultimate Nonograms/Griddlers site and
              software! —
              “The ultimate Nonograms/Griddlers
              software” — A solver and creator for Windows, by
              Yariv Hastilow
World of CryptoPics -
              The ultimate Nonograms/Griddlers site and
              software! —
              “The ultimate Nonograms/Griddlers
              software” — A solver and creator for Windows, by
              Yariv Hastilow
              
             네모네모로직퍼즐-LOGICHOME
              ver6.1 —
              A site for Korean fans to share
              puzzles, by 김경래 (Kyungrae
              Kim); includes a Java helper
네모네모로직퍼즐-LOGICHOME
              ver6.1 —
              A site for Korean fans to share
              puzzles, by 김경래 (Kyungrae
              Kim); includes a Java helper