This paper presents a preliminary study of how French teachers organize themselves in community for producing online resources. We specifically focused on the mechanisms allowing the creation and the sustainability of active communities, applying the ideas of Ostrom and Basurto. We considered several communities in French secondary education (in vocational schools, in documentation) and in primary education, studying what has been published on the web and leading interviews with teachers when it was possible. Our research has been exploratory. Its first results show the existence of continuous processes of creation and organization of communities having different philosophies, rules and policies of expansion.