[NTG-context] looking for a grammar checker in linux/tex/context - or alternative

Some time ago I asked for a speller in linux. I found that aspell does a good job. Now I want one step up: a grammar checker. Since there is no such thing in linux (AFAIK), then my question is: Is there any way to ask context to output the file in a format importable by MS Office? (sorry, I don't like this solution, but if you have one within the realm of linux/gnu licenses, let me know). May be plain 'text' format, or rtf? So I can use the grammar in MS. I listen to any other idea... thank you Ciro