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.
Based on our record, Crossref seems to be more popular. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Can't find DOI of an article by Arthur Kaufman Small Scale Right to Resist. I try to find it on crossref.org but nothing there. I have only a link for an article from heinoline. Unfortunately, I haven't access to this platform:. Source: about 2 years ago
Crossref.org It does a better job on finding things than google scholar and helps to find DOI ( to get articles from sci-hub.se with the doi ). Source: about 2 years ago
Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.
Academia.edu - Academia is a website where you can share papers that are written with other users. You can use a Google or Facebook account to sign in to the website.
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
JabRef - Graphical Java application for managing bibtex (. bib) databases.JabRef · JabRef Help · JabRef | Blog · OpenOffice/LibreOffice .
DeepDyve - DeepDyve provides simple and affordable access to millions of articles across thousands of...
Citavi - Citavi is a program for Microsoft Windows that manages literary references and organizes organizational knowledge.