The physiology of stress is an interesting topic, even to a layman like me. Relaxing, taking time to enjoy beauty, and exhaling slowly, are important lessons for all of us that are often learned the hard way. While learning such a lesson, I became acquainted with the vagus nerve, which plays a key role in the physiology of stress such as regulating heart-rate. From what I read, exhaling slowly causes something called a parasympathetic stimulation that calms certain internal organs, which helps reduces stress.
The screen shot above is of a JavaFX app named Blue Sea developed by Krishna Kishore to learn more about using JavaFX animation capabilities. Quoting Kishore, "In a very short time I am able to produce complex visual effects which previously took days to create in Java 2D". According to the associated blog post where you can run the app, Inkscape 4.7 was employed to create vector images.I found the Big Blue app to be visually pleasing and relaxing; watching the wave at the bottom slowly roll, and clicking the mouse to make flowers grow. Although this is not a stress-relief app per se, I'd like to see a JavaFX app in this vein created especially for that purpose, complete with with relaxing music and a biofeedback monitor. Just throwing that out there :-)
Update 03-Feb-2010: This blog post contains some supplemental info from Kishore, including the source for the app.