I'll format it in a way so that all respective mounts are grouped together.
I'll hide them in spoiler tags, so you won't have to scroll forever.
For those who haven't played it before, you can get an insight in to what mounts were available during official life cycle of the game.
You will also notice that there are a few mounts you won't recognise. They were unreleased models which could have been part of the rumoured expansion (that never happened). Also some of the unreleased mounts were still in development, that they were not coded with animations (static models with graphical clipping/glitches).