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.
Coffitivity - Our coffee shop sounds boost creativity
Noizio - Feeling that the noise of the big city is too much for you to bear?
iAwake Professional - Mind hacks for Professionals
Defonic - Create a unique sound environment at home or in the office
A Soft Murmur - Ambient sounds to wash away distraction.