The DISIT Lab is engaged in the definition, development and deployment of scientific research projects in the area of smart cities since 2013, when the Km4City project was started. At today, it participates to the Select for Cities project promoted by cities of Antwerp and Helsinki, and funded by the European Union’s Horizon 2020 research and innovation programme, and in such a context it has defined and developed a software platform, namely the Snap4City Platform. In the last few months, both professional developers and generic users have been engaged through the organization of a Hackathon to produce applications based on the Snap4City Platform, to demonstrate that the platform enables the seamless production of applications based on it developed by people that are not the developers of the platform itself. In the first part of the meeting, finalists of the Hackathon have diffusely presented their works. Of huge interest the contribution of ideas of participants of the Hackathon, their technological approach to the problem and our subsequent considerations, and the annotations and questions made by the representatives of the city of Antwerp, that have contributed looking at applications with the eyes of a citizen/tourist. In the second part of the meeting, all contractors, thus including the University of Florence that we were representing, have diffusely presented the work performed during the last few months (second phase of the project), that will be evaluated by the promoters of the project in the next few days. Of huge interest in this part of the meeting, the observation of the different aspects of the smartness of cities on which the different contributors have focused, and the innovative solutions that they have adopted both in the building of the base hardware/software architecture, and in the building of plugins aimed at the facing specific challenges (see for example the Digital Enabler platform from Engineering, or the Onesait platform from Indra).