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In a world of multi-stakeholder information and assets provision on top of millions of real-time interacting and communicating things, systems based on Internet of Things (IoT) technologies aim at exploiting these assets in a resilient and sustainable way allowing them to reach their full potential. In this paper we present two innovative smart city IoT applications: the first one refers to heat and energy management, and aims at utilizing different resources (such as heat and electricity meters) in order to optimize use of energy in commercial and residential areas. The second application refers to cruise control for public transportation, and aims at utilizing different resources (such as environmental and traffic sensors) in order to provide driving recommendations that aim at eco efficiency. We also highlight the IoT challenges as well as potential enabling technologies that will allow for the realization of the proposed applications.