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, Ko-fi seems to be more popular. It has been mentiond 91 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.
Doing necessary work. How can I sponsor or otherwise provide fiat for this work? https://buymeacoffee.com/, etc. - Source: Hacker News / 2 months ago
A few alternatives for micro donations that people have mentioned: https://ko-fi.com/ https://github.com/sponsors https://www.buymeacoffee.com/ Any others, let me know. - Source: Hacker News / 6 months ago
I still have to try https://ci-en.net/, https://slushe.com/, https://ko-fi.com/, https://catbox.moe/, I heard they were possible good alternatives. But I couldn't say, dunno yet. Source: 7 months ago
I did, however, remember another crowdfunding platform that may be the best of both worlds here (second highest voted so far being Patreon). Ko-fi: it offers both monthly and one-time donations as well as a store where we could sell things like early access keys or things like that. Their fees are very low as well, capping out at 5%. Source: 7 months ago
With everything going on with Patreon lately that's probably why I've suddenly started hearing about Ko-fi this year. Source: 7 months ago
Buy Me A Coffee - A free, fast and friendly way to accept donations 💰
Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.
Patreon - Patreon enables fans to give ongoing support to their favorite creators.
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
Liberapay - Liberapay is a recurrent donations platform.
JabRef - Graphical Java application for managing bibtex (. bib) databases.JabRef · JabRef Help · JabRef | Blog · OpenOffice/LibreOffice .