The blue social bookmark and publication sharing system.
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ShadowFox is a universal dark theme for Firefox. Ref: old.reddit.com/r/firefox/comments/8z4wx4/any_alternative_for_ft_deep_dark/e2g2tlz/
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.