EarTrumpet - Volume Control for Windows
Volume2 - Volume2 is an advanced Windows audio mixer, a complete replacement for the standard Volume Control.
3RVX - 3RVX is a skinnable volume display and controller.
Sound Control - App-specific volume control
Sound Volume Hotkeys - This tool allows to control sound volume using system-wide hotkeys.
SoundSource - The sound control that should be built into MacOS