Both the raid frames and non-raid unit frames are PitBull. It contains both, and lets you configure the two types of frames differently.
Pitbull is nice in that respect, since you don't have spend extra system memory and cpu on a separate raid frame addon like Grid.
I was looking at your Nightbreeze UI screenshot. What add-on did you use for all the non-raid frames? (Target, Focus, ToT, etc.)