I have so many designer friends and I have literally watched them breaking their heads in the walls because UI was being such a pain in task when their clients were right onto them pestering them for the early delivery of the project. A perfect UI is so much important, I mean people download apps and just because it lacks visual appeal or navigation or some little detail of color and font, and that app is immediately discarded to uninstall, such a cruel thing to do. But that is what makes businesses and designers appreciated and acknowledged, the user feedback about the product and services. So what UI design tool do you generally use in your work? Why would you just choose the same ones over and again? Proving your loyalty to the product or is it that you just are so ‘used’ to it? A software doesn’t work like that. First thing every designer must seek in a UI developing tool is its credibility and efficiency. You may just not be aware what is suddenly new in the market which is more convenient, organized and feature rich. And hey! There is always this one amazing option to work out your UI which usually takes a backseat, a pen and a paper. Yes, a pen, paper, calk, white-board, marker, these traditional ways will always be instant and handy and in cases it works like magic.
Nonetheless, I have sorted 21 amazing UI tools that will help you with your several projects (you must already know a few).
Lucidchart
Adobe Fireworks CS6