I made this applet in 2003 to simulate electrolocation in weakly-electric fish at the behest of Dr. Peter Waser. I was a freshman computer science student at the time. I include the applet here not because I take it to be a bastion of good design, but for posterity.I think it is also worthy of note that, when created, I considered this my most interesting and most difficult project. Now I just see questionable design decisions and a rather lackluster implementation. Nevertheless, I will not be decompiling the code to fix it.
I have removed the link to the fish applet because both Chrome and IE have discontinued support for the Java plugin, but you can see a screenshot here