Noizio - Feeling that the noise of the big city is too much for you to bear?
MyNoise - Custom shaped online noise machines. Many Many generic sounds
Noizer - Ambient sounds like Noisli, but free
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.
Sounds of Earth - Listen to relaxing ambient sounds of nature
Studiowave - Chillout tunes and inspiration