MathMod is described as 'mathematical modeling software to visualize and animate implicit and parametric surfaces' and is an app in the Education & Reference category. There are four alternatives to MathMod for a variety of platforms, including Windows, Mac, Online / Web-based, Android and Android Tablet. The best alternative is GeoGebra Graphing Calculator, which is both free and Open Source. Other great apps like MathMod are Graphing Calculator (Paid), GeoGebra CAS Calculator (Free, Open Source) and Functy (Free, Open Source).
Graph functions in two, three, and four dimensions, explicit, implicit, or parametric. Graph inequalities, contour plots, density plots and vector fields. Use rectangular, polar, cylindrical, or spherical coordinates. Solve equations numerically, graphically, or symbolically.
Functy is a 3D graph drawing package. It allows Cartesian, spherical and parametric curve functions to be plotted and altered quickly and easily. This immediacy and the vivid results promote fun exploration of 3D function.