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SoundBunny is a useful application that allows to control volume levels of all open applications under a Mac system. It has similarities with the Windows 7 built-in volume control feature.
With this application, you can set, for example, high volume level for a game, and set it low for other applications like media player, mail notifications, etc. SoundBunny is very simple to install and use, nothing complicated. At the end of the installation, you need to restart your Mac.
Once launched from the Launchpad, the main window of SoundBunny will display all running applications, drag the sliders to adjust volume levels.
SoundBunny is available in trial mode for 30 days and is compatible with Mac OS X 10.6.8 or later versions, you can download it from here.