This site's listing of official author sites (not always managed by the authors, but at least recognized by them) is organized by the authors' last names. This listing includes writers working in all media, and both in and out of the English-language.
Click on the letter appropriate to the author you are looking for in order to see the available links.
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An index to unofficial and fan sites can be found here.
Click here to see a list of editors' web pages.