Centralised music server interface
Mopidy is a music server that enables users to play music from a multitude of providers - Spotify, Google Music, Soundcloud and of course your own local library. Iris is the front-end to the Mopidy server that makes browsing music a user-friendly and enjoyable experience.
Iris a major pet project of mine, and is humbling to see such widespread of my software (4,000+ monthly users). You can get Iris up and running in 5 minutes, just have a look at the Iris homepage.