Seismic Duck 2.1.0 has been tested on:
Apple's installer building software has proven to be frustratingly unreliable, so Seismic Duck is provided on a .dmg file. The application is unsigned, since Apple sells that privilege for $100, which seems pricey for low-volume freeware.
To run Seismic Duck on Mac OS X:
You can run the application straight from the .dmg or copy it to your Applications folder. Since the application is unsigned ("unidentified developer"), you will need to use "control click" to run it the first time.