http://www.census.gov/population/international/data/ U.S. Census Bureau population statistics and projections for all countries, with the option to display population pyramids.

www.prb.org/ Population Reference Bureau population statistics and rates of growth by regions.

www.clickrepair.net/chaos/ Web-based chaos applet.

populationpyramid.net/ Population pyramids for virtually all countries from 1950 to 2050.

math.bu.edu/DYSYS/applets/ Downloadable Java applets designed to accompany Robert L. Devaney’s A Toolkit of Dynamics Activities, but can be used independently.

forio.com/simulate/simulation/pontifexconsult/how-much-oil-is-left/ Computer “lab” that allows the user to make various assumptions about reserves, consumption, productivity, and cost of production and to then simulate the future reserves and consumption of oil.

demonstrations.wolfram.com/

DiscreteLogisticEquation/ Interactive Internet program that allows you to set the parameter and two separate initial population values and to observe the resulting population fluctuations.