  In this work, we report on recent analyses of a class of models that generate
neutrino mass at the three-loop level. We argue that these models offer a
viable solution to both the neutrino mass and dark matter problems, without
being in conflict with experimental constraints from, e.g. lepton flavor
violating processes and the muon anomalous magnetic moment. Furthermore, we
describe observable experimental signals predicted by the models and show that
they have common signatures that can be probed at both the LHC and ILC.
