La Vue - Cityscape mashup of realtime police radio and ambient music
Noizio - Feeling that the noise of the big city is too much for you to bear?
soundrop - Soundrop is an app that allows you to create your own personalized sound track to keep you focused or relax.
Noizer - Ambient sounds like Noisli, but free
Generative.fm - Endlessly unique ambient music
Defonic - Create a unique sound environment at home or in the office