Free Online Resources

This fulltext search index includes over 25 million research articles and other scholarly documents preserved in the Internet Archive. The collection spans from digitized copies of eighteenth century journals through the latest Open Access conference proceedings and pre-prints crawled from the World Wide Web.

PLOS is a nonprofit open-access science, technology, and medicine publisher with a library of open-access journals and other scientific literature under an open-content license.

bioRxiv (pronounced "bio-archive") is a free online archive and distribution service for unpublished preprints in the life sciences.

ChemRxiv (pronounced 'chem-archive') is a free submission, distribution and archive service for unpublished preprints in chemistry and related areas. It gives researchers across a broad range of chemistry fields the opportunity to share early results with colleagues and respond to comments and recommendations for improvement, ahead of formal peer review and publication.

arXiv is a free distribution service and an open-access archive for 1,860,074 scholarly articles in the fields of physics, mathematics, computer science, quantitative biology, quantitative finance, statistics, electrical engineering and systems science, and economics. Materials on this site are not peer-reviewed by arXiv.

agriRxiv (pronounced ‘agri-archive’) is a free, open access source of unpublished preprints across the agricultural sciences.

MedlinePlus is a service of the National Library of Medicine (NLM), the world's largest medical library, which is part of the National Institutes of Health (NIH). Our mission is to present high-quality, relevant health and wellness information that is trusted, easy to understand, and free of advertising, in both English and Spanish. Anywhere, anytime, on any device—for free.

SocArXiv open archive of the social sciences, provides a free, non-profit, open access platform for social scientists to upload working papers, preprints, and published papers, with the option to link data and code. SocArXiv is dedicated to opening up social science, to reach more people more effectively, to improve research, and build the future of scholarly communication.

CORE is an open access repository for the humanities.

ERIC catalogs education research found in journal articles, books, and grey literature. If there is a PDF icon and “Download Full Text” in the grey box to the right of a bibliographic citation after you search, then ERIC has permission for you to download the article for free. Click the icon or the link to view or download the full text. To include only articles or reports with full text available in ERIC, check the “Full text available on ERIC" filter when you search.

A free preprint service for the psychological sciences.