Hybrid City is an international biennial event dedicated to exploring the emergent character of the city and the potential transformative shift of the urban condition, as a result of ongoing developments in information and communication technologies (ICTs) and of their integration in the urban physical context. It aims to promote dialogue and knowledge exchange among experts drawn from academia, as well as researchers, artists, designers, advocates, stakeholders and decision makers, actively involved in addressing questions on the nature of the technologically mediated urban activity and experience. The second installment of the Hybrid City, that took place in 2013 boasted seven keynote speakers, sixty-eight paper presentations and diverse parallel events, that were documented in the printed volume of proceedings. More info at http://uranus.media.uoa.gr/hc3/