Noisli - Noisli is a fantastic background noise and color generator for working and relaxing. Online soothing ambient sounds like White noise, Rain and Coffee Shop.
Volume2 - Volume2 is an advanced Windows audio mixer, a complete replacement for the standard Volume Control.
Noizio - Feeling that the noise of the big city is too much for you to bear?
Sound Control - App-specific volume control
MyNoise - Custom shaped online noise machines. Many Many generic sounds
Volume Scroll - Volume Scroll lets you control your main volume by hovering with your mouse cursor over the top...