RDX is a User Interface framework.
You can build many User Interfaces (themes). You don't need to know LUA, RDX comes with a IDE built in the game.
You can also load some available themes into RDX. You can load 1, 2 ,3 ... 10 themes into RDX.
More themes will be available with the GA version.
Demo video available in youtube :
Installation : You must install the RDX mediapack version 2.0.0 http://wow.curseforge.com/addons/rdx-mediapack/
Unzip the RDX CORE + RDX MEDIAPACK into the folder Interface\AddOns
\ Launch the game.
Use the key shift with the mouse to move the menu icon RDX.