SMath Studio is described as 'Math program with 'paper'-like interface and numerous computing features. It has an ability to work with systems, matrices, vectors, complex numbers, infinities and fractions. SMath Studio includes integrated mathematical reference book' and is a Calculator in the education & reference category. There are more than 10 alternatives to SMath Studio for a variety of platforms, including Windows, Web-based, Linux, Mac and Android apps. The best SMath Studio alternative is MATLAB. It's not free, so if you're looking for a free alternative, you could try fxSolver or Calcpad. Other great apps like SMath Studio are PTC Mathcad, Giac/Xcas, DYsolve Math Solver and Xcos.
It is an alternative, but honestly, Mathcad has many bugs and it's veeeery heavy. I rather use SMath