Noizio - Feeling that the noise of the big city is too much for you to bear?
Earth.fm - Earth.fm is a non-profit, growing library of pure, high quality nature sounds from around the world.
Noisli - Noisli is a fantastic background noise and color generator for working and relaxing. Online soothing ambient sounds like White noise, Rain and Coffee Shop.
Bridge.audio - The audio cloud
Defonic - Create a unique sound environment at home or in the office
Sounds of Earth - Listen to relaxing ambient sounds of nature