Noizio is an app that will drown out the noise of the street and allow you to concentrate on the work at hand, increasing your productivity. On the other hand, it can also set the mood for a romantic evening or lull you to sleep, ensuring that you will dream soundly all night long. An ambient sound equalizer app for creating a mixture of ambient sounds available for macOS.
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.
Lungy - Next-gen breathing exercises that respond to every breath
A Soft Murmur - Ambient sounds to wash away distraction.
Online Breathing Timer - Breathe to become calm and regain focus
MyNoise - Custom shaped online noise machines. Many Many generic sounds
Breathing exercises - Breathing exercises to calm down and practice diaphragmatic breathing.