Mathematica (officially Wolfram Mathematica) is software suite with a number of math-related applications, including things like machine learning, symbolic computation, and data manipulation and analysis. The programming language used by Mathematica is called the Wolfram Language, and so this page also points to resources for learning Wolfram.
Mathematica requires a paid subscription, but Kenyon provides access to Mathematica via its Virtual Computers. For information on how to access these virtual computers, see the link below: