2. Buff frames are rBuffFrameStyler.
3. Boss frames and unit frames in general are done with oUF. I'm using an edited Skaarj layout.
4. That is Fallen Crusader proc. That area is filled with a 4x2 WeakAuras layout for buffs/procs etc.
5. That would be my rune frames, DocsDebugRunes.
6. I am not, since I do not need to track any of the raids debuffs, and anything that is critical to track is done via WeakAuras.
7. I have a player castbar sitting under my action bars, target castbar is sitting just above where the "Blizzard PowerAura" is. The bar above my actionbars in the screenshot is my swing timer, done with WeakAuras.