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I did a quick search, if it's already been posted then my bad. This online tool can help you when building a website. You enter your url and the website takes screenshots and shows you what your website looks like on a heap of different operating systems & browsers.

http://browsershots.org/

It lets you do a few for free, then they ask that you make a free account with them.

Surprisingly, this may not have been posted before. It is a great tool for cross-browser web development, thank you.