Crossword

Across and Across Lite
Literate Systems' crossword display and construction software. [Windows, MacOS, Linux]
http://www.litsoft.com/across/preview.htm

Arensus Crossword Puzzle Editor
Tool for creating and publishing crosswords. [Windows]
http://www.tea.ch/

EclipseCrossword
Creates crosswords and puzzles, includes project ideas, examples, tutorials and international applets.
http://www.greeneclipse.com/eclipsecrossword/

Henry Casson's Crossword Utility
Enables a crossword grid to be entered and converted to and from a text encoding which can be emailed. Freeware. [Windows]
http://home.freeuk.net/dharrison/puzzles/utility.htm