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.
Spotify - Map shows when two people play same song at same time
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.
Playlist Machinery - Tools that help you create & organize your Spotify playlists
MyNoise - Custom shaped online noise machines. Many Many generic sounds
Magic Playlist - Get the playlist of your dreams based on a song
A Soft Murmur - Ambient sounds to wash away distraction.