COROT (or CoRoT, for Convection Rotation and planetary Transits) was a French (ESA) satellite with two purposes:
COROT was launched in 2006 and was the first satellite aiming to find transits. It viewed a number of fields, up to 6 months per field, looking for planets with short orbital periods. COROT discovered at least 30 planets. I'm not sure but there may still be candidates not yet confirmed.
After a 2.5-year planned lifetime, the mission was extended, operating until a failure in November 2012.