EZ GUI offers more flexibility and higher performance compared to existing OnGUI/Unity GUI-based solutions.
EZ GUI not only gives you performance that is optimized for both mobile and desktop platforms, but also gives you entirely new flexibility to do things that are not possible with Unity GUI.
For more details and demonstration videos, please visit: http://anbsoft.com/middleware/ezgui
Requirements: Compatible with all current versions of Unity (including free).
Open Asset Store
Requires Unity 4.5 or higher. Update now.