Gephi is a freely distributable tool for exploring and analyzing networks, with or without a geographic component. Related items can be associated with each other with different colors based on their properties, and clusters of connections and other patterns can be easily visualized as you rotate and arrange the network. Terrific for social network analysis, e.g. who’s writing to who, as well as economic analysis, e.g. what one country is selling to others, and even for studying biological networks!
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