Studying abroad
Search Engines:
Studying in UK:
Studying in Greece:
Studying in Italy:
Studying in France:
Studying in Australia:
Studying in Netherlands:
Studying in Spain: (μηχανή αναζήτησης για όλα τα αγγλόφωνα Προγράμματα Σπουδών στην Ισπανία)
Studying in Germany:
Studying in Sweden:
Studying in Canada:
Studying in USA:
Studying in Denmark:
Studying in China:
Studying in Russia:
Working abroad
For the EU countries, visit EURES portal.

Working in Australia
Working in Belgium

Working in France

Working in Germany

Working in Switzerland 
Working in USA

Working in Ireland
Working in Spain

Working in Italy
Working in UK

Working in Netherlands

International Search Engines 
EU Institutions 
European Personnel Selection Office
Eures (European Employment Services):
European Organization for Nuclear Research OR European Laboratory for Particle Physics (CERN):
European Institute of Public Administration: 54
European Patent Office:
International Organisations
International Atomic Energy Agency: