There are often cases I see that ImageJ plugins that seems to be very useful is not linked to ImageJ plugin site. Here is one case, I just happened to find.
DeadEasy Caspase ImageJ plugin
“Here, we present a method based on image filtering and mathematical morphology techniques, to count automatically the number of dying cells in intact fruit-fly embryos. We call the resulting programme DeadEasy Caspase. It has been validated for Drosophila and we present examples of its power to address biological questions. Quantification is automatic, accurate, objective, and very fast.”