Onelab (http://onelab.info) is a finite element package based on the open source mesh generator Gmsh (http://gmsh.info) and the solver GetDP (http://getdp.info). It can be used to simulate a wide variety of multi-physic problems: electromagnetics, thermics, mechanics...
Onelab comes packaged with a selection of ready-to-use examples. New models can be added simply by opening the corresponding zip archive (in Safari, iCloud, Dropbox, etc.).