SMath Studio

SMath Studio is a freeware (free of charge, but not libre), closed-source, mathematical notebook program similar to Mathcad. It is available for Windows, Linux, iOS, Android, Universal Windows Platform, and on some handhelds.

Among its capabilities are:
 * Solving differential equations;
 * Graphing functions in two or three dimensions;
 * Symbolic calculations, including solving systems of equations;
 * Matrix operations, including determinants;
 * Finding roots of polynomials and functions;
 * Symbolic and numeric differentiation of functions;
 * Numeric integration;
 * Simple multiline looped programs;
 * User-defined functions;
 * Units of measurement.