I've just finished a set of standalone interactive sound pieces that run only once per computer. Actually, I'm sure there are MANY here who could find ways around the limited lifespan of these standalones, but it would take at least some creativity.
or you can view demo videos and download the software (Win or OSX) at the addres below - the series is at the top:
"Empty Shell, Robbed Time"
I'd love to hear any feedback.