Journals
- Directory of Open Access Journals: DOAJ is a community-curated online directory that indexes - and provides access to - high-quality, peer-reviewed Open Access journals.
- Searchable subject repositories:
- ArXiv
- PubMed Central Open Access Subset
- SocArXiv
- Open Access Directory provides a list of subject repositories
- Browser extensions (Chrome and Firefox): will try to find an Open Access version of paywalled articles, by searching for an article's digital object identifier (DOI), which can look like this: https://doi.org/10.1515/jah-2016-0020
- Unpaywall: searches oaDOI, an index of Open Access content
- Open Access Button: searches oaDOI, along with other sources, and allows you to request an article if an Open Access version is unavailable
Books
- OApen Library: the OAPEN Library contains freely-accessible academic books, mainly in the area of humanities and social sciences
- Directory of Open Access Books (DOAB): the primary aim of DOAB is to increase discoverability of Open Access books
