Guilds
Every guild on the Open Vanilla realms, from the armory (refreshed every ten minutes). In game, /gh opens Guild Hub for your own guild's roster, events, bank log and DKP, and /guilds shows who is recruiting.
Members choose what the armory shows about them (public, friends only or hidden); hidden members count toward a guild's size but are never named. Guild bank logs, DKP and the message of the day stay in game.