[HacktionLab] wire-framing tools

[johnc]

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Hi,

OK this a blatantly cheeky request for some advice on a work related
task so sorry in advance for being a corporate whore!

Can anybody recommend a wire-framing tool:
1) That you have used
2) That is preferably free
4) Open source
3) That a non web dev person could learn to use in a day or so?

Many thanks.

Cheers,
John
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