Its original purpose was to provide a simple means of getting basic sound effects into a game for those people who were working hard to get their entries done within the 48 hours and didn't have time to spend looking for suitable ways of doing this.
There already was a Mac port, but I felt a sudden urge to make one with a native Mac UI, add some proper save/load, and learn Core Data and Bindings while at it. My version's called cfxr (as in "Cocoa sfxr").
Note that I'm not the author of sfxr, I've just ported it. (See also: my announcement blog post)