The blue social bookmark and publication sharing system.
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TagMaps is a toolkit to visualize text (well, tags) geographically on a map. Check out the sample applications, where we use Flickr tags on a map to build a world exploration tool.
BibSonomy is offered by the KDE group of the University of Kassel, the DMIR group of the University of Würzburg, and the L3S Research Center, Germany.