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

Brain.fm - Music designed for the brain to enhance focus, relaxation, meditation, naps and sleep within 10 - 15 minutes of use.

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

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.

Fan of Sleep - White noise generator to help you fall asleep