After dozens of wireframed projects I found myself using only 2 tools, that I would like to share with you.
Tool number 1: Pencil Project http://pencil.evolus.vn/
The only one reason why I put it as number 1, because it is free. Being free is a powerful argument, sometimes a deal breaker.
There are many people who complain about it, but it worked fine for me for a while. Yes, it is buggy, sometimes crashes (never lost any data though) and is not the nicest looking thing out there, but it does its job well. Pencil doesn’t have a native wrapper for Mac, yet, and you have to open it from the Firefox (which I am not using at all).
Tool number 2: Balsamiq Mockups http://balsamiq.com/
Well, they don’t deserve to my number 2, actually, because they are almost perfect. I hate Adobe Air wrap-up though, but it’s manageable. Everything else makes it an absolute winner. You will never buy anything better for $79, speaking about mockup editors and wireframing tools. (People who know me, know that I am really conservative about spending money for software, and I am very picky about whom to pay.)