The blue social bookmark and publication sharing system.
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Doodle helps scheduling meetings and other appointments. Doodle is simple, quick, free and requires no registration. Simply set up a poll, send a link to all participants, watch progress online, and finally choose the most suitable date.
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.