IMPORTANT: I am no longer playing the game and thus will not update this thread anymore. Feel free to take over this thread and copy / edit its content at will (ask a forum moderator for help on this).
Below are direct links to guild lists on the different servers.
Note that this thread is not meant to be a list of guilds!
I'll try to regularly monitor for changes in guild lists, but if you see something needs to be added/modified, do not hesitate to send me a pm about it!