Noizio - Feeling that the noise of the big city is too much for you to bear?
Noizer - Ambient sounds like Noisli, but free
Ambie - Beautiful white noise app to help focus, sleep, or meditate.
Defonic - Create a unique sound environment at home or in the office
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.
Shhh Noise - A free sound generator designed to increase focus and relaxation.