[beepbeep]

Hmm...there is lot more.

Older Audi: locked or open middle differential
Later Audi: Torsen middle diferential
Older Porsche (964): planetary gear middle, lockable with clutch
Newer Porsche: RWD with visco clutch to front axle
Older Volvo: FWD with visco clutch to the back
Newer Volvo, Audi, VW: FWD with Haldex clutch to rear axle:
Older Land Rover: either RWD or AWD with locked middle
Older Audi V8: AWD with visco middle diff

etc...