nXr is an all-in-all citation and reference management solution with three integrated modules- nXr.iNote, nXr.iLibrary, and nXr.iCite. All three functionalities altogether, nXr helps students and researchers with a faster collection of multi-data (texts, images, notes), restoration and literature review, and referencing tasks.
You can also create a single user – group switchable library for your research group which automatically anonymously integrate all group articles and annotations and make them available to all group users.
To become the best reference manager equipped with next-generation tools for performing reproducible impactful research by managing information overload, nXr strives to incorporate new features supported by data analytics and AI.
Qiqqa is by far the strongest solution for research and managing pdf's. Zotero, named as a comparison is weak as it does not allow pdf;s to be loaded into its interface - you need to use a pdf reader, which defeats its whole purpose. With Qiqqa documents in a library can be searched together. It has excellent maps of your libraries. It is not prefect, having a few glitches, but still is the only one of its kind.
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.
Papers - Papers is a research management software designed to streamline searching, aggregating and citing digital reference materials.
JabRef - Graphical Java application for managing bibtex (. bib) databases.JabRef · JabRef Help · JabRef | Blog · OpenOffice/LibreOffice .
RefWorks - RefWorks is an online research management, writing & collaboration tool that helps researchers easily gather, manage, store & share information.
Citavi - Citavi is a program for Microsoft Windows that manages literary references and organizes organizational knowledge.