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.
Puzzles is the computer version of wooden inset puzzles. Each puzzle has 4 to 12 pieces to insert into their appropriate holes. Children will learn matching and memory skills as they solve each puzzle. Published by Dataware.
A set of award-winning authoring tools to help you create interactive exercises, tests and quizzes. The exercises can be put on a Web page, or run as standalone programs at home or in the classroom. A great way to teach any subject - or just for fun.
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.