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

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

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.

ReadCube is a desktop and browser-based program for managing, annotating, and accessing academic research articles.

BibSonomy is a social bookmarking and publication-sharing system.

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.

Qiqqa is award-winning research management software, designed for commercial and academic researchers.

Zotero is a powerful, easy-to-use research tool that helps you gather, organize, and analyze sources and then share the results of your research.