This addon is intended to help you remember which NPC drops which unique item. As you mouse over an NPC, an additional tooltip for the item is shown.
There is data for the mentioned 5.0 and 5.4 rares, Zandalari Warbringers (to help identify which mount they can drop) and some other NPCs, mostly from Pandaria, that drop interesting items.
I'm very open to suggestions what else could be added
r02: removed functionality to equalize the widths of unit tooltip and RaresTip frame. Sorry for that. Didn't work when I tried it on my end, so I forgot about that code, and people disliked it.
r01: initial version. Still has the tooltip "bug" mentioned above, if you like it. May or may not actually work.