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GnuPlot - Gnuplot is a portable command-line driven interactive data and function plotting utility.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
GeoGebra CAS Calculator - Free online algebra calculator from GeoGebra: solve equations, expand and factor expressions, find derivatives and integrals
FreeCAD - An open-source parametric 3D modeler
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming
Graphing Calculator - Visualize equations and functions in 2D, 3D and 4D.