- ABNT 6023
- ABNT 10520
- Anna’s Archive – The largest truly open library in human history. We mirror Sci-Hub and LibGen. We scrape and open-source Z-Lib, DuXiu, and more.
- Connected Papers – Explore connected papers in a visual graph.
- Lens.org – Explore global science and technology knowledge
- Library Genesis – Biblioteca Genesis
- Litmaps – Discover the world of Scientific Literature
- Obsidian – Obsidian is the private and flexible writing app that adapts to the way you think.
- Open Access Button – Free, legal research articles delivered instantly or automatically requested from authors.
- Research Rabbit – We’re rethinking everything: literature search, alerts, and more
- Scihub – O objetivo do Sci-Hub é fornecer acesso gratuito e irrestrito a todo conhecimento científico.
- Scispace – The Fastest Research Platform Ever.
- Scolarcy – Summarize, analyze and organize your research
- Scopus – Comprehensive, multidisciplinary, trusted abstract and citation database
- Semantic Scholar – A free, AI-powered research tool for scientific literature
- Unpaywall – We harvest Open Access content from over 50,000 publishers and repositories, and make it easy to find, track, and use.