Applets
Statistical Java - Probability Distributions:
http://www.causeweb.org/repository/statjava/Distributions.html
Binomial distribution:
Normal distribution:
Poisson distribution:
http://www.uni.illinois.edu/~hcrussel/poisson_processes.htm
http://www.math.uah.edu/stat/applets/PoissonExperiment.xhtml
Exponential distribution: