** Library Guide to Open Access Publishing

ArXiv

Well-established open-access pre-print server hosting unpublished e-prints in Physics, Mathematics, Computer Science, Quantitative Biology, Quantitative Finance, Statistics, Electrical Engineering and Systems Science, and Economics.

bioArXiv

A free online archive and distribution service for unpublished preprints in the life sciences, operated by Cold Spring Harbor Laboratory.

CORE - (U.K.)

Search for open access scholarly articles from institutions across the world.  CORE’s mission is to aggregate all open access research outputs from repositories and journals worldwide and make them available to the public.

CORE: Open Access for the Humanities

Articles, book chapters and other documents authored by humanities researchers and posted on Humanities Commons, a non-profit, academic social networking site.

Digital Commons Network

The Digital Commons Network brings together free, full-text scholarly articles from hundreds of universities and colleges worldwide. Curated by university librarians and their supporting institutions, the Network includes a growing collection of peer-reviewed journal articles, book chapters, dissertations, working papers, conference proceedings, and other original scholarly work. 

Directory of Open Access Journals (DOAJ)

A curated, independent, searchable directory of open access peer-reviewed journals.

Internet Encyclopedia of Philosophy

Open access encyclopedia providing detailed, scholarly, peer-reviewed information on key topics and philosophers in all areas of philosophy.

MedRxiv

A free, preprint server for medical research. Preprints are preliminary reports of work that have not been peer-reviewed.

Open Library

Open Library, a book digitization project of the Internet Archive, provides access to millions of books.   Books in the public domain can be downloaded for free by anyone. Books that are still subject to copyright can be borrowed via controlled digital lending.  An account is not needed to search this collection, but you need to create an Open Library account to either read on their Internet Archive book reader or download to epub/pdf. 
 

Philpapers

PhilPapers is a directory of online philosophy articles and books by academic philosophers and serves as the largest open access archive in philosophy. 

PLOS (Public Library of Science)

Well known open access publisher, founded as a non-profit in 2001 to transform research communication by publishing journals with rigorous reporting and peer review.  

PsyArXiv

A fairly new searchable preprint server for hosting unpublished academic papers in psychology.

PubMed Central

PubMed Central® (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). 

Research Forensic Library

a curated collection of publicly-accessible material relating to forensic sciences.  Based at Florida International University.

SocArXiv

SocArXiv is a free and publicly accessible platform for social scientists to upload working papers, pre-prints, published papers, data, and code.

SSRN

Very large, well established repository of social science (and other) academic papers.  It was founded in 1994 as an open repository, but bought in 2017 by a for-profit publisher, Elsevier.  The vast majority of the papers hosted on the site are free to download.