We are Open Source Publishing. A group of designers working in Brussels. We make books, posters, websites and tools, and we do this using only Free and Open Source Software. As opposed to the industry standard proprietary software, these open softwares allow for further examination and modification, often in collaboration with the community: we feel it is important to have an intimate relation with our tools. Founded in 2006 in the context of Brussels art organisation Constant, the OSP caravan now comprises a group of individuals from different backgrounds and practices: typography, graphic design, cartography, programming, mathematics, writing, performance. Through a collaborative practice, we work on workshops, commissioned or self-initiated projects. OSP has worked with organisations both large and small, and collaborated with individual artists. We have organised workshops at many art schools (Royal College of Art, Merz Akademie, Piet Zwart Instituut) and festivals (Vietnam Open Design Week, Festival de Chaumont). Finally, in divided Belgium, we have won both the most beatiful book of Flanders (Plantin Moretus Prijs) and the most beatiful book of Brussels/Wallonia (Prix Fernand Baudin Prijs).