- DOAB: Directory of Open Access Books (Open Access)
DOAB provides open access to over 62,500 Academic peer-reviewed books from 622 publishers.
http://www.doabooks.org/
- Directory of Open Access Journals (DOAJ)
DOAJ is an online directory that indexes and provides access to quality open access, peer-reviewed journals.
http://doaj.org/
- Open Access Theses and Dissertations (OATD) (Open Access)
OATD.org aims to be the best possible resource for finding open access graduate theses and dissertations published around the world.
https://oatd.org/
- ROAD: Directory of Open Access scholarly Resources (Open Access)
ROAD: Directory of Open Access scholarly Resources, is a service offered by the ISSN International Centre with the support of the Communication and Information Sector of UNESCO. Launched as a beta version on 16th December 2013, ROAD will be developed during 2014 (extension of the coverage, additional features...).
http://road.issn.org/
