Fair list. There are a couple of good addons in there.
Although, I've yet to see the most obscure ones in a list. I probably have them all, but there may be a little bit more out there that were developed later.
For instance, I haven't found decent ButtonFacade skins, the newer ones that work with Masque aren't compatible as far as I know (I tested them and they don't seem to get applied), so I end up with only a few of them, and they're not so great.
Another type of addon I'm yet to see, is a good DK runes tracker. I know there's Engraved, CLC DK (which tracks a little bit more), but they lack a little bit of configs or details/skins. The ones that come with Unit Frames addons are not that great, plus they're obviously, most of the times, attached to the frame, and are not movable like Engraved.
Of course, after you've played a lot with DKs, especially in PvE, it's not that hard to keep track of your Runes, which ones are available and which aren't. But it might be okay for PvP, especially if you're specced to have Death Runes and being able to see their timers and such.
Anyways, cool list.