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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!

1 Answer 1

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

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

2
  • Wow! Where did you find all that?
    – Daniel
    Jun 24, 2011 at 13:00
  • 4
    My friend called google. Jun 24, 2011 at 18:18

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