There are several spell checkers available as open source applications and much has been said about the quality of their output in English but there appears to be very little research when linked to the Arabic language.  However, Hunspell is used with many word processing packages.

Seb has succeeded in getting it to work with ATbar vers 2 which means that the Kit version is now almost in beta and there is the beginnings of an Arabic spell checker.

Internal Alpha testing of the spell checker.