Paper Rater

Ginger Software

White Smoke

This one you could have Google searched my dude.

There are many online grammar checkers, 2 of them that I use every day are spellchecker.net and grammarly.com

Google is your best friend.

Thanks Joe for posting those ones.

LOL. *Are there any good grammar checkers? Good luck. Hahahah

http://proofreadbot.com is free online grammar checker.

I Use These

Spellchecker.net
AbiWord
Language Tool
Grammar Slammer

Yes, grammar can be pretty easy to mess up. Tools can help, but even with tools, one can still mess up grammar.

I would not worry about what you write being perfect. Do your best and don't worry about being perfect. It takes too much time being perfect, IMO.

If you make a mistake in grammar here and there, most people are not going to care. Obviously you are concerned about correct grammar, so whatever you write will have very few, if any mistakes.

use ginger and it's required online in case it's better to handle it

I think you can write the document as well as check its grammar with Google Docs. I find it a pretty great alternative to MS Word.