My Favorites.
http://www.sokofun.de/
SokoFun
http://www.games4brains.de/
G4B Web Site
http://www.high-speed-software.com/sokosave/
SokoSave
https://sourceforge.net/projects/sokobanyasc/
SokobanYASC
http://www.supersoko.com/chs/index.htm
SuperSoko
http://www.freewebs.com/sokofan/
Sokofan
http://www.miremare.com/
3D SokoBan
http://groups.yahoo.com/group/sokoban
Yahoo SokoBan clubs
http://games.groups.yahoo.com/group/sokoban/messages
Yahoo SokoBan message
http://paul.voyer.free.fr/
Paul Voyer (Solver)
http://www.sourcecode.se/sokoban/levels.php
Many Levels
http://kantorek.webzdarma.cz/downloada.htm
Frantisek Pokorny (levels)
http://users.bentonrea.com/~sasquatch/sokoban/
David Skinner (levels)
http://membres.lycos.fr/nabokos/index.html
Aymeric du Peloux (levels)
http://sokoban.online.fr/
Francois Marques (levels)
http://w1.409.telia.com/~u40915103/
Sven Egevad (levels)
http://fruise.googlepages.com/sokoban.html
Lee Haywood
(levels)
http://www.geocities.co.jp/Playtown-Domino/7999/soko/skrmc_a.htm
Kenyam
(levels)
http://www.freewebs.com/dries/soko.htm
Dries De Clercq (levels)
http://www.erimsever.com/sokoban.htm
Erim Sever
(levels)
http://www.supersoko.com/bbs/list.asp?boardid=15
York Shen
(levels)
http://www.sokoban.republika.pl/index.html
Zbigniew Kornas (levels)
http://www.sokofun.de/ziko.html
Zbigniew Kornas (G4B)
http://svb-sokoban.narod.ru/
Serg Belyaev (levels)
http://perso.wanadoo.fr/plamat/sok.html
Philippe Lamat (Soko Scores)
http://sokobano.de/
Fred Minklei (Soko Scores)
http://www.bricks-game.de/
Bricks
http://www.bricks-game.de/html/bricks3.html
Bricks Competition
http://www.bricks-game.de/html/winbricks.html
WinBricks
http://uk.groups.yahoo.com/group/klotski/messages
Klotski forum