DOAJ is an extensive index of diverse open access journals from around the world, driven by a growing community, committed to ensuring quality content is freely available online for everyone.

PMC is a free full-text archive of biomedical and life sciences journal literature at the U.S. National Institutes of Health's National Library of Medicine (NIH/NLM).

All PLOS content is Open Access...PLOS authors publish under the Creative Commons Attribution License. Anyone may copy, distribute, or reuse these articles for any purpose, as long as the author and original source are properly cited.

bioRxiv (pronounced "bio-archive") is a free online archive and distribution service for unpublished preprints in the life sciences.

PeerJ is an Open Access publisher of scholarly articles. We aim to drive the costs of publishing down, while improving the overall publishing experience, and providing authors with a publication venue suitable for the 21st Century.

Project Euclid's mission is to advance scholarly communication in the field of theoretical and applied mathematics and statistics. Close to 20 journals are available open access, many more by subscription.

Preprints is a platform dedicated to making early versions of research outputs available, including original research articles and reviews. Content on Preprints is not yet peer reviewed and can receive feedback from readers.

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.

IssueLab gathers, indexes, and shares the collective intelligence of the social sector. We provide free access to thousands of case studies, evaluations, white papers, and issue briefs addressing some of the world's most pressing social problems.