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I think anyone who uses Linux is aware of aspell. There is also a windows port too, so no one is left out.
I actually have a XOOPS spellchecker module based on aspell - BUILT AND WORKING IN A PRODUCTION SITE! It is really cool, and requires NO MODIFICATION to any core or modules. It will spell check all fields on any page! I love it. It makes updating my website SOOOO much easier.
The only problem is that it requires a directory outside of the module directory ( /speller to be exact. ) I asked for some javascript assistance with fixing this to make it a proper module, but no javascript guru appeared.
I did not want to release it in such a poor state of affairs, but maybe I should.
JMass