Links to other Hexoban implementations
Hexoban Solvers
Hexoban & Sokoban solver by Paul Voyer
Other Hexoban implementations
Other Hexoban levels
Links to other Sokoban implementations
Solvers
Hexoban & Sokoban solver by Paul Voyer
Other Sokoban implementations
XSokoban Home Page  XWindows implementation of Sokoban - source code available
Sokoban ++  Windows implementation of Sokoban. There is a nice 3D (openGL) implementation of sokoban, give it a try.
Sokoban YASC by Brian Damgaard  Windows implementation (Delphi source code available)
SokoSave  by Eric Sunshine and Paul McCarthy for Macintosh and Windows
SokoMind  Gerald Holler's implementation of Sokoban.
SokoFUN  Another nice implementation of Sokoban.
Links to Sokoban levels
Many collections About 10000 levels.
Monthly competition in french (click on GB flag for English)
http://users.bentonrea.com/~sasquatch/sokoban/ David W. Skinner Sokoban page.
Aymeric Du Peloux's Sokoban puzzles page Additional Sokoban levels (page in french).
David Holland's Sokoban puzzles page Additional Sokoban levels.
Yoshio's Sokoban Page Additional Sokoban levels (more than 100).
http://grigr.narod.ru GRIGoRusha levels
Other links
XML parser  Very good (small and fast) library for parsing XML files.
DrFoghs Sokoban pages  Many sokoban related stuff. Levels, skins, program reviews.