  Neutrinoless double beta decay is a lepton-number violating process predicted
by many extensions of the standard model. It is actively searched for in
several candidate isotopes within many experimental projects. The status of the
experimental initiatives which are looking for the neutrinoless double beta
decay in isotopes other than Xe-136 is reviewed, with special emphasis given to
the projects that passed the R&D phase. The results recently released by the
experiment GERDA are also summarized and discussed. The GERDA data give no
positive indication of neutrinoless double beta decay of Ge-76 and disfavor in
a model-independent way the long-standing observation claim on the same
isotope. The lower limit reported by GERDA for the half-life of neutrinoless
double beta decay of Ge-76 is T1/2 > 2.1e25 yr (90% C.L.), or T1/2 > 3.0e25 yr,
when combined with the results of other Ge-76 predecessor experiments.
