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Possible Duplicate:
Which prototyping tools?

Things I would like:

  • Open source
  • No restrictions
  • Simple and powerful

marked as duplicate by Charles Boyung, Patrick McElhaney Feb 7 '11 at 15:55

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You might like the answers to these questions:

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Free? Most of the apps listed in this question have a free account, but you'll have to pay for more space/users/etc.

Real free are Pencil and Google Draw using this stencil.

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