IndieVolume - IndieVolume makes Windows programs use separate volume controls independent of other Windows...
EarTrumpet - Volume Control for Windows
SoundBunny - SoundBunny allows you to control the volume level for all open applications on your Mac.
Volume2 - Volume2 is an advanced Windows audio mixer, a complete replacement for the standard Volume Control.
Voicemeeter Banana - VoiceMeeter Banana, the Advanced Virtual Audio Mixer by V.Burel
iVol - iVol is a program you can use to adjust the sound volume of your computer in an extremely easy way.