These are some of the major major online repositories of resources, journals, theses, and dissertations.
Journals and research papers
Directory of Open Access Journals (DOAJ) This library is a network of open access journals of many types. It has its own quality rating system so that students can select only refereed journals. Core World's largest collection of open access research papers. Over 180 million items. Google Scholar A specialised search engine that searches only legitimate academic sources. Estimated to have about 160 million indexed documents. JSTOR Journals and e-books. 26,000 journals, 70,000 books and over 2 million primary sources. Researchgate A professional network for researchers with 135 million pages, mostly in experimental sciences. Academia A social network for academics to share research papers. It has 25 million papers. Membership results in large amounts of email.
Theses and dissertations
EBSCO Open Dissertations EBSCO Open Dissertations is a collaboration between EBSCO and BiblioLabs that brings an innovative approach to increasing traffic and discoverability of Electronic Theses and Dissertations (ETD) research. Networked Digital Library of Theses and Dissertations Promoting the adoption, creation, use, dissemination, and preservation of electronic theses and dissertations (ETDs). It supports electronic publishing and open access to scholarship in order to enhance the sharing of knowledge worldwide. It provides resources for university administrators, librarians, faculty, students, and the general public. Topics include how to find, create, and preserve ETDs; how to set up an ETD program; legal and technical questions; and the latest news and research in the ETD community. Open Access Theses and Dissertations (OATD) Open access graduate theses and dissertations published around the world. Metadata (information about the theses) comes from over 1100 colleges, universities, and research institutions. OATD currently indexes 4,729,889 theses and dissertations. Open thesis A searchable database of theses, dissertations, and other academic documents. ProQuest ProQest has 5 million theses and dissertations and grows by 200,000 items per year. It is an offfsite repository for the U.S. Library of Congress, and claims to be the largest repository of theses and dissertations in the world. Some services are not free. CAUL Theses and dissertations from Australia and New Zealand. Carnegie Mellon University Research data and scholarly outputs produced by members of Carnegie Mellon University and their collaborators. Stanford University Dissertations and theses, from Stanford University and other universities. Scholarworks Walden University's open access dissertation site. Scholar Commons Respository of University of South Florida
Open Access Digital Theological Library (OADTL) Curates high-quality content in religious studies and related disciplines from publisher websites, institutional repositories, scholarly societies, archives, and stable public domain collections. More than 22,000 titles are from the last 25 years, more than 15,000 from the last 10 years, and more than 8,500 from the last 5 years. Virtual open access library Bibliographic records to open access (free) theological resources, organized by format. These include E-books (more than 21,000 titles), Bible commentaries, open access journals, and research websites. Theological Commons (Princeton Theological Seminary) Over 120,000 resources on theology and religion. It consists mainly of public domain books and also includes periodicals, audio recordings, photographs, manuscript collections, and other formats.
Library of Congress Library of Congress Is the US national library with nearly 170 million items. Trove Australia's national repository of documents and resources, with about 6.5 billion items.
DOAR Directory of Open Access Repositories. ROAR Registry of Open Access Repositories.
Other specific fields
ERIC (Education) The Education Resources Information Center (ERIC) is run by the Institute of Education Sciences and contains about 1.6 million indexed items. National Institutes of Health A database of about 6.1 million articles on health-related matters. Project Muse (Humanities and social science) A collection of 125 journals and 60,000 books in humanities and social science; a project of the libraries of Johns Hopkins University.