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: 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.

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 highly popular site that provides access to over 64.5 million academic papers by bypassing publisher paywalls through educational institution proxies. : A legal tool that harvests open-access content

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

: A Chrome extension that finds the DOI of a paper on your current page and automatically searches for it across various open-access repositories like ArXiV and the Internet Archive .

: Many researchers upload their full-text papers here; you can often download them directly or request the full text from the authors. Helpful Browser Extensions & Tools