Mathematica
A Powerful Computing Platform
Sample inputs and outputs
In[1]:= Solve[x^2+5==y^2,{x,y},Integers] Out[1]:= {{x->-2,y->-3},{x->-2,y->3}, {x->2,y->-3},{x->2,y->3}} In[2]:= Plot3D[Sin[x+y^2],{x,-3,3},{y,-2,2}] Out[2]:= ( See graph on right ) In[3]:= 20! Out[3]:= 2432902008176640000
No. Mathematica is a closed source application from Wolfram. Most colleges and universities have licenses for Mathematica, so if you are a student or professor you probably already have access. Otherwise you will need to pay for a license.
The list of built-in functions is far too long to include here, but you can explore the capabilities online.
Mathematica version 1.0 was released on June 23, 1988. It has been expanding its capabilities to the present day.
Originally Mathematica was described as "a system for doing mathematics by computer." But as the years passed its capabilities expanded to include the sciences, engineering, finance, and more. So the name was no longer a proper fit. So Wolfram decided to called the format and catalog of functions the Wolfram Language while keeping the name Mathematica for the notebook interface. There seems to be a reluctance from Wolfram to simply get rid of the Mathematica name and call it something more general.