FxSound - Clearer Sound for Your PC. The new FxSound boosts your sound quality, volume, clarity and bass.
Magic Playlist - Get the playlist of your dreams based on a song
Boom 3D - Audio enhancer with 3D surround sound
Spotalike - Spotify playlist with similar songs, according to Last.fm
Equalizer APO - A system-wide equalizer for Windows 7 / 8 / 8.1 / 10 with channel remapping/copying capabilities
Spotify - Map shows when two people play same song at same time