Since you ask for a plug-in I assume this is a Web application. I don't know of any offhand, but a search of the R4/R5 forum on LDD yielded the following, which mentions JSpell (though not in a positive way), Hot Lingo and Spellchecker:
Dig Deeper on Lotus Notes Domino Application Development
Primary school kids could soon be taught about Web 2.0 applications such as Wikipedia and Twitter in the classroom if a leaked document seen by the Guardian...
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