nXr Alternatives

Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.

Open Source

Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.

Preferred Patron is the top Customer Loyalty Software Program for businesses in any industry of any size.

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Papers is a research management software designed to streamline searching, aggregating and citing digital reference materials.

RefWorks is an online research management, writing & collaboration tool that helps researchers easily gather, manage, store & share information.

Qiqqa is a free research and reference management software. It can be used in many organizational projects from the academic to the personal to the business endeavor. Read more about Qiqqa.

BibDesk is an organizational software created to help you edit and manage your bibliography. It keeps track of your bibliographic information as well as said information's associated web links and files. Read more about BibDesk.

Bookmarking for the power users of the web. A privacy focused extension to annotate, search and organize what you've seen online.

Clean and simple and reference management for the web. Sync your PDFs to Google Drive and cite your papers in Google Docs.

Citavi is a program for Microsoft Windows that manages literary references and organizes organizational knowledge.

Docear

All your articles, photos, video & content from web & apps in one place.

Open Source freemium

Graphical Java application for managing bibtex (. bib) databases.‎JabRef · ‎JabRef Help · ‎JabRef | Blog · ‎OpenOffice/LibreOffice .

Diigo is a powerful research tool and a knowledge-sharing community