You are here
N-O
Networked Digital Library of Theses and Dissertations (NDLTD) 
The Networked Digital Library of Theses and Dissertations (NDLTD) is an international organization dedicated to promoting the adoption, creation, use, dissemination, and preservation of electronic theses and dissertations (ETDs).
OAIster provides access to over twenty two million items fom open access repositories across the globe. OAIster can be searched or browsed.
Over 2000 open access books from across the sciences.
Open Depot
Open Depot is mainly a repository for researchers who do not have a repository to deposit their open access work in their own institutions. It is managed by EDINA in the UK.
Open Humanities Press is an international, scholar-led open access publishing collective whose mission is to make leading works of contemporary critical thought available worldwide.
Open Research Online is the Open University's repository of research publications and other research outputs.
OpenDOAR, the Directory of Open Access Repositories, is a directory of academic open access repositories. Included in this resource are repositories from global universities and colleges, as well as Libraries, historical societies, and a range of other academically focused organizations.
P-S
A growing collection of open access preprints related to biology.
PhilPapers provides access to scholarly resources in the discipline of philosophy, including books, journal articles, and book chapters. Many resources are open access.
PLOS publishes a suite of influential journals from all areas of science and medicine that contain rigorously reported, peer reviewed Open Access research articles.
POPLINE contains the world’s most comprehensive collection of population, family planning and related reproductive health and development literature.
This database provides access to open access dissertations and theses.
Free Access upon registration to resources that connect healthcare professionals with up-to-date news and information that matters for patient care
PubMed is a service of the U.S. National Library of Medicine that includes over 16 million citations from MEDLINE and other life science journals for biomedical articles back to the 1950s. Also access the Entrez nucleotide, protein, taxonomy, structure, genome, expression and chemical databases.
PMC Canada aims to provide a freely accessible, Canada-based archive of biomedical and health research findings. PubMed Central Canada is a free digital archive of full-text, peer-reviewed health and life sciences literature based on PubMed Central, the archive developed by the US National Library of Medicine and in partnership with the National Research Council's Canada Institute for Scientific and Technical Information (NRC-CISTI) and Canadian Institutes of Health Research (CIHR). The search interface allows anyone to browse, search and download articles.
PubMed Central (PMC), "the U.S. National Library of Medicine's free digital archive of biomedical and life sciences journal literature", provides access to a collection of free and open access full text journals.
Social Science Research Network
Social Science Research Network (SSRN) is devoted to the rapid worldwide dissemination of social science research and is composed of a number of specialized research networks in each of the social sciences.
Synergies provides the Canadian scholarly publishing sector with the first virtual showcase for a large corpus of research publications.