This is a Java applet I designed almost a decade ago for simulating and visualizing three models of ecological systems. Some background about the models, what they have to do with each other and why they're interesting, is given in this paper I authored in 2008. The source code for the applet can be found in the java directory, while the compiled applet and instructions for running it are in the class directory.
roywright/applet2008
Another project from grad school, visualizing some systems of ordinary differential equations
Java