by non english do you mean the country or the language? i can't recall many ska bands where they didnt sing in english, although my friend does have a track of this mexican ska band singing "ghost town" by the Specials, it was almost like it didnt fit lol
I'm american and there are some good ska bands here: Streetlight Manifesto, Ivy League, The Arrogant Sons of Bitches, Big D and the Kids Table, Reel Big Fish, Less Than Jake, MU330, and i think that Save Ferris was a ska band (at least for a little while they were).
you've probably heard most of these, just thought i'd throw in my two cents worth.