The blue social bookmark and publication sharing system.
Martin Bokeloh, Michael Wand, Hans-Peter Seidel, and Vladlen Koltun. ACM Trans. Graph. 31(4):78 (2012)
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.