Headspace - Meditation made simple. Brilliant things happen in calm minds.

Blanket - Improve focus and increase your productivity by listening to different sounds. Or allows you to fall asleep in a noisy environment.

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.

MyNoise - Custom shaped online noise machines. Many Many generic sounds

Calm - Calm.com can help you reduce stress and increase calm.

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.