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The best software that i have come across and is highly looked up to in the industry is Axure Pro. You can make a fully working wireframe or mock up with click through It is a little pricy but worth every penny. here is the link http://www.axure.com/
Try Keynote and the share link feature. I just started using templates from http://keynotopia.com and have been very impressed with it. These templates are designed for drag/drop building of interfaces in either PowerPoint or Keynote.
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