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I don't know if they ever sold this as a stand-alone, but the best
example of a grammar checker I ever used with the one included with
WordPerfect 6.0. Grammatix, I think it was called. Very good at finding
run-ons, passive voice, problems with parallel structure.
Pithy Saying: Do not walk behind me, for I may not lead.
Do not walk ahead of me, for I may not follow.
Do not walk beside me, either. Just leave me the hell alone.