Platforms where researchers, universities, and educators share academic papers, textbooks, and courses for free. Open access means anyone can read, download, and learn — no paywalls, no institutional logins.
The world's largest preprint server. Over 2 million research papers in physics, mathematics, computer science, and more. All papers are free to download as PDF.
Peer-reviewed, openly licensed textbooks by Rice University. Covers biology, chemistry, physics, economics, psychology, and more. Used by millions of students. Free PDF downloads.
Free course materials from MIT covering virtually all undergraduate and graduate subjects. Includes lecture notes, problem sets, and exams — many available as PDF.
Free archive of biomedical and life sciences research from the U.S. National Library of Medicine. Over 8 million articles, all available as free PDF downloads.
Free courses in math, science, computing, economics, and humanities. Practice problems, instructional videos, and personalized learning. Printable worksheets available as PDF.
An index of over 20,000 peer-reviewed open access journals across all disciplines. Every article is freely available — no subscriptions needed. A gold mine for researchers and students.
AI-powered academic search engine by the Allen Institute for AI. Indexes over 200 million papers with smart recommendations, citation context, and free PDF access where available.
Peer-reviewed open textbooks from the University of Minnesota. Covers accounting, biology, chemistry, economics, law, music, and more. All free to download as PDF with open licenses.
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