This article contains the three contributions of the mini-symposium about MOOCs (Mas- sive Open Online Courses) organized by Violaine Louvet (Institut Camille Jordan, CNRS). The first contribution is from Alain Mille from LIRIS, about the main research questions on this new way of learning. The second one is from Marc Buffat, LMFA. He reviews some open source Web2.0 computa- tional environments which are used in a new MOOC on scientific computing. Marco Picasso, EPFL, is the author of the last contribution where he discusses the development of a MOOC in Numerical Analysis, before the MOOC, the course during the MOOC and the results.