1)   StatAssist 2.0
StatAssist displays graphs and related properties of more than 40 probability distributions. It calculates statistical moments, quantiles, and tail probabilities depending on the distribution parameters specified by the user.

 2)   ESBPDF Analysis - Probability Software 2.3
ESBPDF Analysis provides everything needed for using Discrete and Continuous Probability Distributions in a single application, handling all the Probability Combinations for you with Graphing and info. Designed for Windows - optimised for Windows XP

 3)   AMRandom 4.0
AMRandom is a Delphi translation of Alan Miller's Random Module for FORTRAN. Supplies several different distributions of random numbers including Normal, Poisson, Gamma, etc. Includes Full Delphi Source and Demo