More than 40 sport teams exist, and the sports practiced include aerobics, yoga, Pilates, basketball, volleyball, soccer, handball, ping pong, tennis, martial arts inside the campus facilities and swimming, polo, rowing, yachting, rappelling, rafting, squash, wind surfing, and equestrianism outside. Each year several inter-departmental championships are organized among the teams of the university faculties. NTUA student's teams have been distinguished and received many awards in Panhellenic University Games, as well as in university games abroad. Open source There is an open source students group whose purpose is to promote the use of open source software throughout the university and beyond. Furthermore, NTUA officially supports open source software by using it in its laboratories and other facilities, but also hosting mirrors for all major open source projects with a collection of over 2.5 terabytes of free and open source software. Foreign languages English, French, German and Italian are the four languages taught in NTUA. All non-exchange students have to choose one from those as a mandatory foreign language course. For foreign students, the NTUA Linguistic Service offers the option of attending Greek courses during the entire academic year, free of charge. These courses are intended to provide students with the basic linguistic tools, so that they can understand and communicate efficiently with people in Greece. Participation in international organizations CESAER – Conference of European Schools for advanced Engineering, Education and Research EEGECS - Network on European Education in Geodetic Engineering, Cartography and Surveying SEFI – Societe Europeene pour la Formation des Ingenieurs (European Society for Engineering Education) TIME – Top Industrial Managers Europe Student unions NTUA Students' Formula Team Society of Naval Architects and Marine Engineers, NTUA Athens Local BEST Group Electrical Engineering STudent's European Association Local Committee of Athens (EESTEC) Euroavia Athens, NTUA International Association for the Exchange of Students for Technical Experience (IAESTE) American Institute of Chemical Engineers Student Chapter (AIChE) Notable alumni Nicholas Ambraseys - professor of engineering seismology at Imperial College London Dimitris Anastassiou - developer of MPEG-2 algorithm for transmitting high quality audio and video over limited bandwidth and Columbia University professor of electrical engineering John Argyris - one of the founders of the finite element method, professor at Imperial College London and University of Stuttgart Costas Azariadis - professor at the Department of Economics, UCLA and Edward Mallinckrodt Distinguished University Professor in Arts & Sciences, Washington University in St. Louis Dimitri Bertsekas - professor of