Defonic - Create a unique sound environment at home or in the office
Power Nap App - Best napping timer with relaxing sleep sounds
Noizio - Feeling that the noise of the big city is too much for you to bear?
MyNoise - Custom shaped online noise machines. Many Many generic sounds
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.
Earth.fm - Earth.fm is a non-profit, growing library of pure, high quality nature sounds from around the world.