Top Alternatives to Qiqqa

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.

Citavi is a reference management program.

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

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

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

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

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

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.

BibSonomy is a social bookmarking and publication-sharing system.