Paperpile Alternatives for Mac OS X

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

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.

DEVONthink a document and knowledge management app for the Mac.

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

Docear is an academic literature suite. Docear bundles several applications for academics. As of now, these applications are BibTeX based reference management, mind mapping, and some pdf management capabilities.

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

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

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

SCIENTILLA is a free scientific register for organizations and researchers.

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