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I would recommend http://mynoise.net/NoiseMachines/ for all noise related needs.

This website allows you to customize every noise to your liking and the selection of soundscapes is HUGE.

For relaxation, try http://www.ambicular.com

Pretty great, but I can't seem to turn back from the level of customization allowed by myNoise. You can load a soundscape, mute individual noises, increase other, allow the soundscape to animate and evolve over time, etc.

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