Zooom provides users the ability to work with any application window using shortcuts for moving, resizing and zooming - which increases your productivity because it’s then much easier to focus on what you really want to be doing!
This takes advantage of Apple’s Accessibility API. I still find a mouse or trackpad a better solution. The problem to me is that most of the keyboard shortcuts are governed by my customization of applications (especially, TextMate). There’s no place for this app to fit in my system.
But I would say this is a great app for those who have a certain disability.