Spell checkers also welcomed.
To the best of knowledge, they don't do that. And I know a few authors (mostly Sci-Fi).
My advice: find a writer's group. Or try one of these links. They are oriented toward SF/F, though. You might want to try your own search.
http://www.critters.org/
http://sff.onlinewritingworkshop.com/
http://www.sfwa.org/writing/
I suggest that you avoid writer workshops. Avoid "how to write" books. And avoid seminars. Write the book you want to write, then think about selling it.