How to make money with free and open source software ... that's the question! Often the easy answer is “by delivering services to the clients using the software”. A more nuanced answer could be: “to be open in your business model, to cooperate with other FOSS project communities and to provide a sustainable service offer with quality assurance to the clients”. Dirk Frigne, co-founder of Geosparc and spiritual father of Geomajas will share his experience with open source adepts and business people interested in starting doing business in an open and transparent way.