PLATO (for Planetary Transits and Oscillations of Stars) is an European Space Agency spacecraft in planning aimed at finding extra-solar planets. It is aimed at relatively bright stars (magnitudes 4-11), that will support informative follow-up studies. It will identify extrasolar planets by spotting transits and radial velocity variations, and transit timing variations. Plans are to launch in 2026.
A 2014 update to the plan was called PLATO 2.0, which specifically aims at terrestrial planets around Sun-like stars in the habitable zone.