  We review current experimental efforts to search for neutrinoless double beta
decay (0$\nu\beta\beta$). A description of the selected leading experiments is
given and the strongest recent results are compared in terms of achieved
background indexes and limits on effective Majorana mass. A combined limit is
also shown. The second part of the review covers next generation experiments,
highlighting the challenges and new technologies that may be necessary to
achieve a justifiable discovery potential. A potential synergy with direct dark
matter searches, which could be an especially prudent strategy in case the
axial vector coupling constant is quenched in 0$\nu\beta\beta$ decay, is
emphasized.
