VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
Equalizer APO - A system-wide equalizer for Windows 7 / 8 / 8.1 / 10 with channel remapping/copying capabilities
AIMP - AIMP : Free Audio Player : Официальный сайт программы
FxSound - Clearer Sound for Your PC. The new FxSound boosts your sound quality, volume, clarity and bass.
foobar2000 - An advanced freeware audio player for the Windows platform.
Boom 2 - Boom is a simple volume booster that lets you boost the volume of your Mac and your music files.