Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Sketch - Professional digital design for Mac.
FreeCAD - An open-source parametric 3D modeler
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.