Noizio - Feeling that the noise of the big city is too much for you to bear?
CSS Galore - Rich collection of css generators with live preview.
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.
Programming Knowledge Map - Interactive knowledge map for beginners (in JavaScript)
Defonic - Create a unique sound environment at home or in the office
Noizer - Ambient sounds like Noisli, but free