  The quest for neutrinoless double-beta decay ($0\nu\beta\beta$) is a
promising experimental approach to search for lepton number violation in weak
interactions, a key ingredient in generating the matter-antimatter asymmetry
through models of Leptogenesis. The $^{136}$Xe-based $0\nu\beta\beta$
experiments KamLAND-Zen and EXO-200 currently set the most stringent limits on
this process using two very different techniques. Each are preparing the next
generation experiment, which will search for $0\nu\beta\beta$ in the parameter
space corresponding to the inverted hierarchy for neutrino mass. Both of these
techniques scale well to larger volumes while incorporating interesting new
techniques. We present the status of current and next generation experiments of
these collaborations and present two developments with the potential to
identify $\beta\beta$ decay events.
