Solve problems in various areas of math calculation expertise.
Powerful and extensible computer system for scientific and general purpose calculations. It is simple and interactive means of solving problem in various areas of expertise. Console based scientific calculator, 2D and 3D graphs plotter, differential, algebraic and polynomial equation solver, unit converter, physical constants reference, statistical analysis, data fitting, programming environment. Or simple calculator of your choice.
Its flexibility and usability are awesome! Actually it is more powerful and easier to use than Matlab. And certainly it is almost 100 times chipper :) Really useful for graph plotting, data analysis, and studying programming.
Cons
Well, you need to spend some time to get into it. Especially if you are lazy about reading help, which is more than helpfull.