...It has powerful nonlinear capabilities (including tension/compression only material like concrete) and most types of analysis (modal, thermal, buckling, coupled, etc) . See home page at http://www.dhondt.de
New versions can be obtauned here: http://calculixforwin.blogspot.com/2015/05/calculix-launcher.html
PS Appimages for Scilab, wxMaxima and GNU Octave were added