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.
Headspace - Meditation made simple. Brilliant things happen in calm minds.
Noizio - Feeling that the noise of the big city is too much for you to bear?
Synctuition Meditation Program - Synctuition Meditation Program is a world’s most leading meditation app that comes with brand new 3D sounds that enhance the quality of sleep significantly.
White Noise - White Noise to help you sleep and games to wake you up.
Calm - Calm.com can help you reduce stress and increase calm.