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Naturespace is an audiophile's dream. Along with relaxing sounds of nature, if you're listening through a pair of good earbuds, you can position where in space various facets of soundscapes are located. In other words, you can make a bird sound like it's to your left or right, or maybe even behind you. This is all achieved by a simple, intuitive interface. If you're looking for the utmost in realism to accompany your relaxation, this is it!
App Store Link: Naturespace (Free + optional in-app purchases)
White Noise Pro allows you to build your own relaxing soundscapes or listen to prearranged ones. As you've undoubtedly noted, there are a few apps like this one throughout this gallery, but they all have their own set of sounds, usability factors, and feature sets. Visit the official app link below to read more since I just recently purchased this one and have yet to give more than a couple of (satisfactory) listens.
App Store Link: White Noise Pro ($2.99)
Though it's primarily a weather/time app, Living Earth HD is a great app to keep open next to you on your iPad while doing other work. There's something considerably calming to me about the zoom-able 3D simulation of Earth, which allows you to see other parts of the world from a satellite's-eye view. Simplistic, beautiful, and relaxing.
App Store Link: Living Earth HD ($0.99)