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.
Sounds of Earth - Listen to relaxing ambient sounds of nature
Noizio - Feeling that the noise of the big city is too much for you to bear?
Serene - The macOS app to get your focus back
Moodly - Get a better sense of focus and relaxation by listening to ambient nature sounds.
Fan of Sleep - White noise generator to help you fall asleep