  The T-REX project aims at developing novel readout techniques for Time
Projection Chambers in experiments searching for rare events. The enhanced
performance of the latest Micromegas readouts in issues like energy resolution,
gain stability, homogeneity, material budget, combined with low background
techniques, is opening new windows of opportunity for their application in this
field. Here we review the latest results regarding the use and prospects of
Micromegas readouts in axion physics (CAST and the future helioscope), as well
as the R&D carried out within NEXT, to search for the neutrinoless double-beta
decay.
