11

I have never heard of one; but I don't know where to look to make sure. This is something I've been wondering for a long time!

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7

Yes, here's a link that talks about an example, The Switcher.

And here's a great link that lists them all.

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  • Wow! Where did you find all that? – Daniel Jun 24 '11 at 13:00
  • 4
    My friend called google. – Lance Roberts Jun 24 '11 at 18:18

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