EarTrumpet - Volume Control for Windows
Volume2 - Volume2 is an advanced Windows audio mixer, a complete replacement for the standard Volume Control.
KMix - KMix is an application to allow you to change the volume of your sound card.
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.