Proofread Bot plugin for WordPress automatically checks your content for grammar, style, statistic and plagiarism issues. This is a premium service
When you are on the “Add New” or “Edit Post” screens you will have a box with a Proofread Bot button, and clicking it will pass your content to Proofread Bot for analysis. In a few seconds you will receive a detailed report with all the issues found, for a visual overview take a look at the screenshots.
Download: http://wordpress.org/extend/plugins/proofread-bot/
