Hesuvi - Hesuvi imitates the binaural sound effect of many surround virtualizations by making use of...
Dolby Home Theater - Dolby Home Theater v4 delivers a surround sound experience through a PCs built-in speakers, any pair of headphones, or a connected home theater system.
DFX Audio Enhancer - Formerly known as DFX Audio Enhancer, FxSound Enhancer instantly boosts the sound quality of the music on your PC.
Letasoft Sound Booster - Boosts sound volume above maximum level
Equalizer Pie - Equalizer Pie is a free audio manipulation application for OS X.
Equalizer APO - A system-wide equalizer for Windows 7 / 8 / 8.1 / 10 with channel remapping/copying capabilities