AP StyleGuard: Software for your AP Style

PC (not Mac) software to check and edit your AP Style while you're writing (via Mashable):

AP StyleGuard, powered by Equiom Linguistic Labs, is a powerful yet easy solution that integrates with Microsoft Word and provides automatic checking of your documents for AP style. Using defined structure and rules similar to Word’s spelling and grammar checking, AP StyleGuard helps ensure the consistency of your writing style. It saves you the time of manually referring to the AP Stylebook and offers recommendations on items you might not have realized are covered by AP style.