PTC MathCAD. https://www.mathcad.com/de

MathCAD-Youtube: https://www.youtube.com/results?search_query=MathCAD

MathCAD Express: https://www.ptc.com/de/products/mathcad-express-free-download (ohne Symbolische Mathematik)

HTL-MathCAD-Ressourcen: http://www.math-tech.at/