Hello, I develop an open source grammar checker (run as a service) called After the Deadline. It's used on WordPress.com and we have plugins for Firefox and Google Chrome. Recently, I put together an OpenOffice.org extension using Daniel and Marcin's LanguageTool OO.org extension as an example.
You can download it at: http://www.afterthedeadline.com/download.slp?platform=OpenOffice After the Deadline checks English grammar and style. It also uses a trigram language model to provide a contextual spelling checker similar to Microsoft Word 2007/2010 on Windows. Feedback welcome. -- Raphael Raphael Mudge Code Wrangler, Automattic http://www.automattic.com P.S. My apologies if this was sent twice. I noticed I wasn't subscribed when I sent the first message.