Vectr - Free vector graphics editor. A simple yet powerful web and desktop cross-platform tool for everyone.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Vecteezy Editor - Free Online Vector Editor - Design and customize SVG illustrations and graphics quickly and easily in your browser.
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