ClouT will provide infrastructures, services, tools and applications that will be reused by different city stakeholders such as municipalities, citizens, service developers and application integrators, in order to create, deploy and manage user-centric applications taking benefit of the latest advances in internet of things and cloud domains. The major outputs will be: i) a smart city infrastructure with a near to infinity processing and storage capacity of data from trillions of things and people that are integrated via virtual services in the Cloud while keeping their universal interoperability; ii) a set of platform level tools and services aiming at facilitating IoT application development, deployment and supervision iii) secure data access and processing mechanisms that can handle big data acquired from the heterogeneous sources in quasi real-time; iv) innovative city applications and field trials in four pilot cities: Santander and Genova in Europe, Mitaka and Fujisawa in Japan. Furthermore, one of ClouT’s goals is to join forces and create a long-lasting synergy for smart city initiatives between Europe and Japan.