A friend created a simple app called Concrète Mixer, designed to play and process audio files semi-randomly (within selected parameters).
It runs off a Raspberry Pi, so very portable and cheap to set up. He imagined it being a cool thing for gallery installations or perhaps providing a chance element to respond to in a live performance, etc.
He now has a Pi running the code streaming live to the web, which is pretty fun.
He's also put his code on Github and I can pull out his instruction video if anyone's keen.
I hope this is of interest as something to listen to, to contribute some audio to, and/or for developers to play around with.