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- The open library for classics and more. For people in germany: Projekt-Gutenberg, as the global version is blocked.
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- World's largest collection of open access research papers (they claim).
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Sci-Hub
- No list of open libraries can go without mentioning Sci-Hub as source of scientific papers. As the website have to move from time to time and not beloved by the big players it's better to search yourself for the current instance/web address.
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Z-lib(rary)
- Same as Sci-Hub but easier to use.
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- World's simple linux news aggregator. There're some other variants about different topics like math, physics...
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- A technical news hub.
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- As the name suggests, the aim is to take the news slowly in this fast-paced world.
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- A list of nonfiction books reviewed by academics.
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- The MIT Press open access portal.
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- A specialized platform in literary.
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- A volunteer-driven project that makes free open sourced ebooks out of public domain books.
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- A audio books platform which unique selling point is allowing you to download the books.
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- A curated list of "bullshit-free" news.
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- A platform with a huge collection of book recommendations.
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- An AI-based search bot for books' contents.
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- Use typesense search engine to go through millions of free books from the open-library (internet archive).
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- World's catalog (sorry to disappoint you cat lovers), connecting service of thousends of libraries all over the world (but not everywhere).
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- Create RSS feeds out of your favorite channels or users from the most used platforms. It's an open-source self-hosted service, but there's already a demo instance here.
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- Books recommendations' platform. Unique here is its Escape, where you get books recommended to you out of your literary buble.
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- A books recommendations platform where books get presented based on specific topics.
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- Recommendations platform for music, movies, tv shows, books, authors, games and podcasts.
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- An open-source web app to browse calibre databases.
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- A tool to show you similar books to your search input. Managed by Global Network Of Discovery and accompanied by a Discover project.
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- A search engine for .pdf files.
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- An open-source RSS search engine with ML-supported hints.
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- An open-source desktop RSS reader app.
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- An open-source minimalist desktop feed reader.
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- An open-source wikipedia frontend with focus on simplicity and modern design.
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- An open-source plugin for Zotero to allow advanced management of PDFs/attachments.
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- LinkedIn-like approach of the academical research community.
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- The traditional community of academics.
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- A crowdsourced list of resources and tools of DRM-free multimedia (ebooks, videos, audios and software).
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- A platform/community that's focused on e-books and e-readers.
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- A social platform for the book community.