Qiqqa
Mendeley
Zotero
JabRef
Citavi
Docear
Paperpile
BibDesk
BibBase
Papers by ReadCube
ProCite
Zotero
Pybliographer
I Librarian
EndNote
Aigaion Reference Management System
Qiqqa BibBaseQiqqa 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.
Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.
Papers by ReadCube - ReadCube Papers is a sumptuous reference manager helping out academic writers to get the most out when it comes to access and discovering more citations with multiple libraries or databases.
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
ProCite - ProCite is a tool for creating citations according to the standard defined by the users.
JabRef - Graphical Java application for managing bibtex (. bib) databases.JabRef · JabRef Help · JabRef | Blog · OpenOffice/LibreOffice .
Citavi - Citavi is a program for Microsoft Windows that manages literary references and organizes organizational knowledge.
