Crosswords (or xwords, to use its Sourceforge project name) is a free, open source implementation of the rules of Scrabble™ for handhelds. It is currently shipping on PocketPC, PalmOS and eBookman.

PalmOS	eBookman	PocketPC

The eBookman version is no longer actively supported, and is not described here. This site concentrates on the PocketPC and PalmOS versions.