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: A completely legal resource that indexes high-quality, peer-reviewed, open-access journals across all areas of science and technology.

For discovering these papers, the following search engines are highly effective: Google Scholar Semantic Scholar CORE Baidu Scholar The best academic search engines [Update 2025] - Paperpile Download Zh092022 pdf

: A legal tool that harvests open-access content from over 50,000 publishers and repositories, providing access to roughly 20 to 55 million scholarly articles. : A completely legal resource that indexes high-quality,

: Similar to Unpaywall, it helps users find legal, free versions of research articles that are behind paywalls. Specialized Academic Search Engines 000 publishers and repositories

: These platforms collectively offer over 10 million books and 85 million articles.