Boom 3D - Audio enhancer with 3D surround sound
Bragi - Wireless, H2O resistant, noise-canceling in-ear tracker.
Boom 2 - Boom is a simple volume booster that lets you boost the volume of your Mac and your music files.
Apple - Available on iOS
eqMac 2 - The open-source macOS audio optimizer 🎛️
DJI Fly - DJI Fly is an app that provides you an intuitive interface and helps you to discover GEO zones and scenic flight locations nearby you effortlessly.