We received a lot of good proposals and deciding which ones to accept is not an easy task. A number of proposals are still being reviewed and we are still working with some speakers. We can already announce the following main track presentations: Performance track * "Building High-Performance Language Implementations With Low Effort", by Stefan Marr * "IgProf", by Giulio Eulisse * "Superoptimization", by James Pallister * "Ubiquitous Performance Analysis and System Introspection", by Lukas Berk Time track * "Computers, Clocks and Network Time", by George Neville-Neil Languages track * "Design and Implementation of a Perl Number Theory Module", by Dana Jacobsen More information at https://fosdem.org/2015/schedule/