Browser extension searches for OA versions of paywalled content. Works with Chrome, Firefox, Safari, iPad, and Internet Explorer. If you can't find OA version of an article, this service can also help reach out to authors to request the article.
Browser extension searches for OA versions of paywalled content. Works with Chrome and Firefox.
CORE (COnnecting REpositories) aggregates all open access research outputs from repositories and journals worldwide.
The Digital Commons Network brings together free, full-text scholarly articles from hundreds of universities and colleges worldwide.
DOAB is an online directory that indexes and provides access to high quality, open access academic books.
DOAJ is an online directory that indexes and provides access to high quality, open access, peer-reviewed journals.
OAIster is a union catalog of over 30 million records representing open access resources.
The OAPEN (Open Access Publishing in European Networks) Library contains freely accessible academic books, mainly in the area of humanities and social sciences, from European publishers.
The Stanford Encyclopedia of Philosophy (SEP) organizes scholars from around the world in philosophy and related disciplines to create and maintain an up-to-date reference work.