The Seventh International Conference on Communities and Technologies (C&T 2015), hosted by the University of Limerick, Ireland, took place between 27 and 30 June 2015. This biennial meeting serves as a forum for stimulating and disseminating research on the complex connections between communities --- both physical and virtual --- and information and communication technologies. This seventh edition of the conference aimed to provide a stronger link with community activists, in particular with the work being done and published in the field of 'Community Informatics'. Therefore, the conference was co-sponsored by the Journal of Community Informatics (http://ci-journal.net/index.php/ciej) aiming to revitalize the academic discussion in a way that also makes the academic discourse more relevant for practice and to widen the base of relevant case studies. At the same time, this collaboration aimed to strengthen the reflection and discussion on these practice-based cases.