The thing that I like the most about Wolfram Mathematica is that it is incredibly versatile. It handles almost all of the facets of technical computing starting form simple algebraic equations, solving ordinary and partial differential equations to image/ audio processing and machine learning. Moreover, Mathematica also has incredibly powerful graphing and modeling capabilities. The interface is aesthetically pleasing and intuitive. The ability to add hierarchical cells is a big advantage and allows to format notebook in a beautiful way. Regarding the features, Wolfram Mathematica has almost everything you need. Moreover, it's ability to be integrated with C++, Python and other languages, makes it an exceptionally powerful application.

A complete tool to make symbolic computation with possibility to draw

Implements a wide range of mathematical functions and the interface is easy to use.