MathCAD[1] was the first to use the notebook approach. It was/is a neat application, more along the lines of Matlab than a CAS like Mathematica. [1] http://en.

MathCAD[1] was the first to use the notebook approach. It was/is a neat application, more along the lines of Matlab than a CAS like Mathematica. [1] http://en.wikipedia.org/wiki/Mathcad http://en.wikipedia.org/wiki/Mathcad