Mars Express was an ESA mission to study Mars. It included a lander, Beagle 2, which failed. The Mars Express Orbiter was successful, gathering data on Mars' atmosphere, surface and subsurface.
Looking for water and past or present life on Mars.
ESA, DLR, IAS, Instituto Nazionale di Astrofisica, Swedish Institute of Space Physics, Rheinishes Institut für Umweltforschung, LATMOS, Istituto di Astrofisica e Planetologia Spaziali​, NASA, CNES, ASI, ISAS, DNV, Kongsberg, CAPTEC, Astrium, AEA, DOWTY, DERA, TELDIX, EADS, TTE, INTESPACE, STARSEM, Alcatel Espacio, CRISA, CASA, Finavitec, Saab Ericsson Space, TERMA, TNO, Nexans, LEGOICA-B, Austrian Aerospace, Contraves, ALENIA, Officine Galileo.