The Kaleidoscope 2013 conference - Building Sustainable Communities - was the fifth in a series of peer-reviewed academic conferences organized by the Telecommunication Standardization Sector of the International Telecommunication Union (ITU-T) with the technical co-sponsorship of the IEEE Communications Society and the Institute of Electronics, Information and Communication Engineers of Japan (IEICE). These papers at K-2013 focused on multidisciplinary aspects of future ICTs including future services and applications demand as well as socio-economic, cultural, ethical, legal, and sustainable development policy aspects of communities of the future. These conference proceedings include the full text of papers accepted for lecture and poster presentations (after a double-blind review by a panel of over 140 subject matter experts), as well as three invited papers and a summary of the keynote speeches. The 33 papers reproduced here should provide readers with valuable information relating to this essential field of studies.