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.

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

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

SCIENTILLA is a free scientific register for organizations and researchers.

BibSonomy is a social bookmarking and publication-sharing system.

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

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

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.