EarTrumpet - Volume Control for Windows
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
Volumouse - From authors website:
iVol - iVol is a program you can use to adjust the sound volume of your computer in an extremely easy way.
KMix - KMix is an application to allow you to change the volume of your sound card.