Qiqqa
Mendeley
Zotero
JabRef
Citavi
Docear
Paperpile
BibDesk
Akonter
BibSonomy
Tagpacker
Diigo
Pocket
ymarks
Folkd
Pinterest
Akonter social bookmarking site founded in 2011, is a website for saving web pages or favorite URLs public or private, and save multiple favorite websites on one page, it's specialized for business, shopping, marketing and services tags It can be used to attract more target audience.
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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.
Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.
BibSonomy - BibSonomy is a system for sharing bookmarks and lists of literature (BibTex format).
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
Tagpacker - A free tool to quickly collect, organize, and share your favorite links.
JabRef - Graphical Java application for managing bibtex (. bib) databases.JabRef · JabRef Help · JabRef | Blog · OpenOffice/LibreOffice .
Diigo - Diigo is a powerful research tool and a knowledge-sharing community
