are there any sci-writing/checking tools? - (Apr/09/2010 )

Dear all,

i was wondering if there are any scientific writing softwares or online tools, non-the-less english grammer correction tools avaible for free download.
any help inthis regards is appriciable.
regards
m

I'm not sure about online tools or apps, but when I'm confused. I just google.

For example you may enter the following search: "their vs there grammar" usually the top three results will be good enough to find your answer.

Oh, I have the same confusion,waiting for expert.