Vectary - Vectary is a free, online 3D modeling tool and sharing platform.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Modelo - 3D design collaboration reimagined
FreeCAD - An open-source parametric 3D modeler
VR Sketch - A tool for designers to draw inside virtual reality
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming