Ear Candy - Ear Candy is a sound level manager that nicely fades applications in and out based on their profile...
Volume2 - Volume2 is an advanced Windows audio mixer, a complete replacement for the standard Volume Control.
Sound Control - App-specific volume control
Audio Sliders - Volume Control replacement that is five times smaller than its Windows counterpart.
Power mixer - Power Mixer is a complete Windows volume control replacement.
Voicemeeter Banana - VoiceMeeter Banana, the Advanced Virtual Audio Mixer by V.Burel