Noizio - Feeling that the noise of the big city is too much for you to bear?
Headspace - Meditation made simple. Brilliant things happen in calm minds.
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.
Calm - Calm.com can help you reduce stress and increase calm.
zenmix.io - Ambient background sound generator
Pacifica - Stress and anxiety relief through beautiful CBT tools