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.
zenmix.io - Ambient background sound generator
Noizio - Feeling that the noise of the big city is too much for you to bear?
Moodly - Get a better sense of focus and relaxation by listening to ambient nature sounds.
A Soft Murmur - Ambient sounds to wash away distraction.
Hipster Sound - Be productive at home with the sounds of busy cafes.