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Thinkmap Inc.: Visual Thesaurus
The most visual thesaurus you will ever see! Watch words become alive and move in front of your eyes. This resource offers a trial version free, which only allows you to look up a certain number of words before it makes you pay....
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Aiga: Graphic Design Archives
The AIGA archives cover a variety of design categories including book design, editorial design, experience design, illustration, information design, motion graphics, package design, and others.