One of the actual values of the Big Data approach relies nowadays in the smart usage of data to support predictive and prescriptive analysis. In this context, many innovative techniques are becoming essential to properly collect, classify and visualize information, through brand new paradigms. The role of open source communities and ecosystems in this process is crucial and highly beneficial to drive and speed up the Big Data adoption and to foster innovation. The OW2 Big Data Initiative aims to collect and organize ideas and experiences from technological, industrial, scientific and business actors in order to foster the growth of a business ecosystem bringing new opportunities to different stakeholders exploiting the OW2 code base.