there are ready innovators and experimenters in every community who, with access to the Internet, the knowledge commons and a makerspace, could copy, modify and invent technologies for tackling their own communities’ most pressing needs, from rainwater harvesting and passive solar housing to agricultural tools, medical equipment and, yes, wind turbines. What’s still missing, however, is a dedicated global digital platform enabling them to collaborate with researchers, students, enterprises and NGOs worldwide to develop free open-source technologies.