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.
EarMaster - Professional software for ear training and practical music theory on Windows and Mac.
A Soft Murmur - Ambient sounds to wash away distraction.
Meludia - Listening exercises and to sharpen your ear and music theory skills
MyNoise - Custom shaped online noise machines. Many Many generic sounds
LenMus - LenMus is a free program for learning music.