Make an easy to use, easy to modify, cross-platform GUI!
The Unity GUI system is nice, but limited in terms of functionality. You can't see how it looks until you press play, you have to do resolution calculations.
UniGUI lets you use regular GameObjects as commonly used GUI elements. You can deactivate them, move them, change their look before and at run-time, and even move your GUI system from desktop to web to iphone to android without changing a single line of code!
See a demo here