Not sure how they work exactly, but have you looked at <a href="http:&#x2F;&#x2F;noredink.com" rel="nofollow">http:&#x2F;&#x2F;noredink.com</a> (and as another commenter mentioned, <a href="http:&#x2F;&#x2F;grammarly.com&#x2F;" rel="nofollow">http:&#x2F;&#x2F;grammarly.com&#x2F;</a>)?  I&#x27;d be interested in your thoughts.