http://www.cdyne.com/SpellChecker/
I have tested the code some and it is a neat little checker and it is free. I am a terrible javascript programmer. Otherwise, I could probably add a custom button in Cute Editor that calls the code for the spell checker. Maybe someone else could take a look and get it working. I will be hacking at it for a while to see if I can get something going.
So far I know that the spellcheck.asp is looking for an actual textarea which Cuteeditor does not have. I have managed to get around this a little by calling the contents of the DIV tag that the contents are entered into. Where I have hit my road bloack is selecting all of the words and then when the spell check is complete rewriting all of the contents of the editor with the correct text.
I guess a big question I have is what would happen to images. Since I have not had it working yet with a DIV tag I am uncertain of the results.
If anyone has any thoughts I would be interested in hearing them.