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Blender - Blender is the open source, cross platform suite of tools for 3D creation.
GnuPlot - Gnuplot is a portable command-line driven interactive data and function plotting utility.
FreeCAD - An open-source parametric 3D modeler
Dr. Geo - Dr. Geo, a software to design & manipulate interactive geometric sketches.
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming
Giac/Xcas - Free computer algebra system