DOAJ The Directory of Open Access Journals is a collection of over 10,000 publications, aimed at creating a comprehensive index of high quality Open Access Journals. Journals which best exemplify openness and quality are awarded the DOAJ Seal.
OpenDOAR is an authoritative directory of academic Open Access Repositories
BioMed Central is an Open Access publisher owned by Springer. It publishes over 260 journals in the fields of Science, Technology, and Medicine.
JURN is an Open Access journal article search engine dedicated to the Arts, Humanities, Science, Business, and other topics.
PLoS (Public Library of Science) is a non-profit journal publisher that publishes several Open Access Science journals. Most journals are restricted to a single subject, and some have subjective selection criteria, but PLoS ONE accepts all technically and ethically sound research.
PubMed Central is an archive of freely available biomedical and Life Science journal articles compiled by the US National Institutes of Health's National Library of Medicine (NIH/NLM).