Nomad Sculpt - Nomad is a sculpting & painting mobile app, available on Android and iOS.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
ZBrush - ZBrush is a digital sculpting and painting software solution.
FreeCAD - An open-source parametric 3D modeler
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming
Sculptura - 3D sculpting for everyone