Krisp - Mute the background noise during your calls
Defonic - Create a unique sound environment at home or in the office
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.
ROOM - A Personal Space for The Open Office
Noizio - Feeling that the noise of the big city is too much for you to bear?
GitHub Audio - Tracks events across GitHub to generate calming work music