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The SMART CITY is an important field for ubiquitous computing (UC) and ambient intelligence (AmI). Data vitalization related to in city data collection and their appropriate diffusion to city users (actors) and their services (applications) is the main problematic. To put it into practice a real augmented environment middleware for data collection and sharing is needed, as well as location based services, mobile and in-environment human computer interactions (HCI) and just in time contextual mobile learning. To illustrate and concretize this problematic we present three case studies: a dynamic lane allocation system, a system for goods urban delivery and a bus shelter based communication.