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?
Calm - Calm.com can help you reduce stress and increase calm.
A Soft Murmur - Ambient sounds to wash away distraction.
Pacifica - Stress and anxiety relief through beautiful CBT tools