Here you can find my (and probably from other contributors as well) research work of AC:WW.
If you are interested into the Save Research structures, take a look here. It has been moved to the Universal-Team site.
You can find a few tools i created for AC:WW inside the tools
directory.
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ACWW Web Save Editor: A work in progress Animal Crossing: Wild World Web Save Editor made in Javascript & HTML.
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LeafEdit + LeafEdit-Core: An Animal Crossing Wild World, New Leaf and Happy Home Designer Save Editor for the Nintendo 3DS made in C++.
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WildEdit: An Animal Crossing: Wild World Save Editor for the Nintendo DS(i) made in C++.