Hardy-Weinberg simulator. With one population, both allele and genotype frequencies are plotted. Up to five populations may be simulated simultaneously. When more than one population is simulated, the graphs show the p or q frequencies. This should be drawn to students' attention to avoid confusion. I've used this in a second semester majors' lab course in conjunction with other Hardy-Weinberg lab activities. Both students and TAs spoke favorably of it. I will continue to use it.
Controls are not entirely intuitive. Help option provides explanations at a sophisticated level. Requires Flash 5.0 or higher.