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I have implemented a spell checker for one of my XOOPS sites (
GCNM.org.uk) using the aspell/pspell functions.
It adds a "Check Spelling" button to forum and comment posts that shows as a preview with combo boxes for miss-spelt (miss-spelled?) words with alternative to choose from.
In theory it should be able to support multiple languages, but I was concentrating on English first.
I have yet to update to XOOPS 2.0.7 and plan to add the spell checker to news posts too.
If you want patch files when I'm done, let me know.