PLAXIS 3D - PLAXIS - Essential for geotechnical professionals. 2D & 3D finite element software for geotechnical analysis of deformation and stability of soil structures
FreeCAD - An open-source parametric 3D modeler
midas Gen - Structural Analysis and Design
OpenSCAD - OpenSCAD is a software for creating solid 3D CAD objects.
Robot Structural Analysis Professional - Structural Analysis and Design
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.