TL:DR; The program "Adivina" will guess what you are thinking.
Adivina is a program or joke very easy and totally free. It does not occupy scarcely space and is very light. If you turn him, ultimately you will find the mathematical why of this curious program. Follows his instructions and verify it.
Highly realistic simulation lets you learn while you have fun trading stocks and bonds. Try to build a $100,000 inheritance into a retirement fund and, along the way, qualify to also do short sales and trade put and call options and commodity futures
Statistical analysis, fitting and visualization of multi-parameter data sets. Statistical schemes cover creating conditional histograms, curve fitting with least square method and user defined formula, multivariate state of art fitting.
Calculator for vectors, matrices, complex numbers, coordinates, intersections and function plotting. For objects like point, line, plane and sphere distances, intersections, volume, area of squeres, area of a triangle can be calculated.