Are the founding principles of open source transferable to agriculture? (..) We look at two case studies: a management software for farmers developed by – and called – Ekylibre; and a cooperative that provides farmers with machines that can be self-constructed, l’Atelier Paysan. Both structures are studied by retracing their history and form of organization, studying how they enact the principles of open source, and by describing their tools within their economic and political context.