During the past years there has been a growing trend within traditional education to ‘open up'. The case of MIT's OpenCourseWare initiative marked the start of the Open Educational Resource (OER) movement, a movement largely strategically driven on institutional levels. With this movement good quality tools and educational materials were made freely available to educators and learners throughout the globe. More recently one can observe a further type of openness within the educational domain, an openness where formally enrolled students engage with their peers at the web, resulting to an ever blurring border between the formal and the informal and providing the potential of taking further advantage of the opportunities the participatory web provides. Those attempts, unlike the OER case, seem to be more driven by individuals on a course level, but not be strategically addressed at the institutional level. This knowledge café is aimed at advancing our understanding on Open Course design by drawing on the Open Source case and recent trends in formal education.