Volume2 - Volume2 is an advanced Windows audio mixer, a complete replacement for the standard Volume Control.
AudioBus - With Audiobus, the revolutionary new inter-app audio routing system, you can connect your...
Sound Control - App-specific volume control
Loopback by RogueAmoeba - Get all the power of a high-end studio mixing board, right inside your Mac!
Power mixer - Power Mixer is a complete Windows volume control replacement.
LiveTrax - LiveTrax is an app by MasterMedia Productions through which musicians can control the playback of their favorite track during live performances by using simple controls.