Blender - Blender is the open source, cross platform suite of tools for 3D creation.
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
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming
Robot Structural Analysis Professional - Structural Analysis and Design