Church of Mog have a lot of UK players.
Chocobo Inc is US/EU with a fair amount of EU players.
There's also The Sons of Trabia which are US/EU

You can apply to CoM here
You can apply to Chocobo Inc here
And I can get you a pearl to The Sons of Trabia if you send me a tell sometime in game.

The French shell I'd guess would be Chocobo Battalion