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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.
Based on our record, Leapian 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.
If you don't mind an Electron or web-based app with a subscription, you could also look at Zenreader [0], Polar [1] or maybe even Readwise [2]. Zotero will also have a PDF Reader app with Markdown export soon [3]. And some cross-platform note taking / PKM apps also have some kind of PDF annotation support (directly: Logseq [4]; via plugins: Obsidian [5], Roam Research [6]). That said, all these apps are very... - Source: Hacker News / about 2 years ago
I bumped into https://zenreader.co.uk ages ago but never tried it. Source: almost 3 years ago
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.
JabRef - Graphical Java application for managing bibtex (. bib) databases.JabRef · JabRef Help · JabRef | Blog · OpenOffice/LibreOffice .
ZoteroBib - ZoteroBib is a free service to help people quickly create bibliographies without installing any...
Citavi - Citavi is a program for Microsoft Windows that manages literary references and organizes organizational knowledge.
BibDesk - 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.