FreeCAD - An open-source parametric 3D modeler
SDC Verifier - SDC Verifier is an FEA engineering software to perform structural verification according to industry standards and safety codes.
SketchUp - 3D for Everyone
ANSYS Workbench - Simulation and Multiphysics platform
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
PLAXIS 3D - PLAXIS - Essential for geotechnical professionals. 2D & 3D finite element software for geotechnical analysis of deformation and stability of soil structures