Try this very handy website. I use it for all of my college papers.
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Spellchecker.net also checks grammar.

http://www.spellchecker.net/spellcheck/
Source(s):
http://www.spellchecker.net/spellcheck/

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I didn't try it but I will bet you a Crispy Cream donut that Microsoft Word will do it.
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There are plenty. I have Adobe GoLive 6, part of the Adobe Creative Suite, CS for short, that automatically back-checks everything and gives all sorts of flags and warnings, even on web pages you're writing, you can click a button in the toolbar and it will highlight text that's wrong.

There are also websites that will do it for you, I don't know of any offhand but I'm sure you could use google to find them. Google 'html validation' or something similar. I've also seen web sites that validate css (cascading style sheets) and I've stumbled across (stumbleupon.com) pages/sites that convert html to xhtml, stuff like that but I wouldn't know enough about them to point you to any; again, google is your friend.
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