Mockup , Prototype Tool Please

Hi folks,

I am looking for a free (or very cheap) tool for doing mock-ups (prototypes) of screens.

I am designing some software to process simple university applications.
I need 2 or 3 screen loads of data for standard stuff, name,address, age, education, qualifications etc.

Similar to  but free!

I am just experimenting ....
Patrick O'DeaAsked:
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Patrick O'DeaAuthor Commented:

In the intervening time I stumbled upon the Evolus one and it seems quite good.

You assistance is appreciated
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