1)   Universal Scientific Calculator 3
Math Functions, factorization, financal, average, regression, factorial, dates, complexes, charts, units converter, ephemerids, Euler, Simson, gravitation. Fourier Series, Pi, Solar System, many games, Molar Mass, Taylor, Bernoulli, Gamma...

 2)   Factorizer 9.42
A program to find prime numbers and pairs of primes, to decompose numbers into their prime constituents, to find all factors of any positive integer up to 2,147,483,645, and to plot Erdos-Kac and Palmen Color histograms.

 3)   Prime Integer Observatory 1.0
This application illustrates the notion of an integer’s factors, and of the related property of integers called primeness, or primality. An integer is called prime if it is the product of only one distinct pair of integers.