ScarletUI is a UI modification addon that helps you manage settings and positions of your Chat, Actionbars, UnitFrames, RaidFrames, Nameplates, and CVars.
Each of the modules can be enabled or disabled depending on your preferences, positions can be adjusted with the "Movers" which allow you to drag the frames to new positions on your screen, or you can opt to use the sliders or input boxes for pixel perfect values.