JSTOR is a digital library of academic journals, books, and primary sources - including OA materials. For researchers who are unafiliated with an institution that provides subscription access, perform your search first, then narrow the results using the left-side menu for "ACCESS TYPE: Content I can access."

Lists EBSCO open access resources

DOAJ is a community-curated online directory that indexes and provides access to high quality, open access, peer-reviewed journals.