Boom 3D - Audio enhancer with 3D surround sound
Noizio - Feeling that the noise of the big city is too much for you to bear?
Boom 2 - Boom is a simple volume booster that lets you boost the volume of your Mac and your music files.
Endel.io - Personalized sounds to help you focus and relax
eqMac 2 - The open-source macOS audio optimizer 🎛️
Halo - Halo is a supply chain analytics and business intelligence software solution.