Benubird PDF is a document organizer with support for tags and collections.

BibSonomy is a social bookmarking and publication-sharing system.

colwiz (collective wizdom) is free web, desktop and mobile based research management software.

Docear is an academic literature suite. Docear bundles several applications for academics. As of now, these applications are BibTeX based reference management…

JabRef is a reference management software that uses BibTeX and BibLaTeX as its native formats and is therefore typically used for LaTeX.

Paperpile is a web-based reference management software, with special emphasis on integration with Google Docs and Google Scholar.

BibDesk is an open-source reference management software package for macOS, used to manage bibliographies and references when writing essays and articles.

Citavi is a reference management program.

DEVONthink a document and knowledge management app for the Mac.

EndNote is a commercial reference management software package, used to manage bibliographies and references when writing essays and articles.

Mendeley is a free reference manager and an academic social network.

Papers helps you collect and curate the research material that you're passionate about.