Elmer is an open source finite element software suite particularly well suited for the study of multiphysical problems. In Elmer each physical model is a dynamically linked solver and there is no upper limit to the number of different solvers. Elmer includes at least basic models for many branches of computational engineering, e.g. fluid mechanics, solid mechanics, heat transfer, electromagnetics, acoustics. Elmer has been parallized with MPI and has demonstrated good scalability up to thousands of cores.