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.
Chalk - Chalk is a calculator that tries to do right what others do wrong.
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.
chitchat - Chat Room with Selfies and Pagers (yes, pagers!)
MyNoise - Custom shaped online noise machines. Many Many generic sounds
Twist - Check fewer notifications, do more meaningful work. Twist is the team communication app for calmer, more organized, and more productive teamwork.
A Soft Murmur - Ambient sounds to wash away distraction.