I made an add-on in 2018 to browse all WoW 3D NPC models directly inside the game. It's main purpose is to be used along with a Morpher. However you can simply enjoy discovering all new models as soon as they are added into the game and without any add-on update. Someone reached out to me to suggest a new feature to see mounts in a new tab, so here it is ! Download link :https://www.curseforge.com/wow/addons/takus-morph-catalog/files