There's a few listed on the FFXIV roleplayer's site:
http://ffxiv-roleplayers.com/forumdi...srvr=Gilgamesh

And then the other ones I know of are

LFRP

And the three Roleplayer Coalition's ones:

Coalition OOC
Coalition OOC 1
Coalition OOC A

I'm sure there are more, but just between those there are around 500 RPers.