Accounting software for Linux?

Does anyone know what accounting software there is for Linux for
running a medium to large sized business?

And if not that, what accounting software do other medium-large sized
businesses use for accounting? I can't imagine they're all using
QuickBooks. ;D

--
"Well, it don't make the sun shine, but at least it don't deepen the shit."
-- Straiter Empy, in _Riddley_Walker_ by Russell Hoban