Behind every free idea, whether it is a software or a platform or a foundation, there is a community that animates it. This community can emerge spontaneously or be structured from the start, but at some point, it requires a little organization and direction. As in any group of people who share common interests, there can be moments of divergence or disagreement. This conference is feedback from more than 20 years of participation and guidance within large communities, with their strengths and weaknesses, and the exploration of the paths towards maturation and solidification of these communities.