When you create something you love, it feels good to give it away for people to tinker around and do great things with it. That is what is open-source is all about. But what happens when the cost of maintaining an open-source project becomes too high to sustain? Some people would abandon it, but not Francois Zaninotto, CEO of Marmelab. Realizing the untapped potential of React-Admin, he managed to build a sustainable business model from an open-source core. Find out how he did it in this conversation. Plus, get a glimpse of his other project, GreenFrame.io, which allows users to estimate the carbon emissions linked to user scenarios on a web application and use that information to create a carbon reduction strategy.