That's tough. To be a "franchise" I assume a series must have at least two installments. These still sold okay, but they're not triple-A franchises by any stretch.
Super Monkey Ball -- just got Deluxe for Xbox today
Tenchu -- up until the newest one, that is
Z-Axis' extreme games -- this includes the Dave Mirra series, Aggressive Inline (my fave), and yes, even BMX XXX
Dead to Rights -- pt. 2 isn't technically out, but it looks promising.