Open Access Repositories are freely accessible online digital archives hosting research outputs that are deposited directly by authors (known as self-archiving). Repositories are designed to store, preserve and provide access to research outputs in perpetuity. The full text content and metadata is harvestable by search engines and other discovery services.
There are several main types of Open Access Repositories:
Institutional Repositories - research output from a particular institution (eg the University of California's eScholarship)
This a list of some of the largest and most well known Open Access Repositories and search engines.
BASE (Bielefeld Academic Search Engine) is one of the world's most voluminous search engines especially for academic web resources. BASE provides more than 240 million documents from more than 8,000 content providers including most of the repositories listed below. You can access the full texts of about 60% of the indexed documents for free (Open Access). BASE is operated by Bielefeld University Library.
SciELO is a bibliographic database, digital library, and cooperative electronic publishing model of open access journals and preprints. SciELO was created to meet the scientific communication needs of developing countries and provides an efficient way to increase visibility and access to scientific literature.
arXiv Pre-print repository hosted by Cor nell University covers scholarship in physics, mathematics, computer science, quantitative biology, economics, and statistics.
EarthArXiv has partnered with the California Digital Library (part of the University of California system) as the server host and submission platform (formerly partnered with COS). The CDL also supports eScholarship, the UC's repository for UC produced scholarship and research.
RePEc Research Papers in Economics (RePEc) is a collaborative effort to enhance the dissemination of research in Economics. More than 2000 archives have contributed over 2 million research pieces to the repository.
The Redalyc project is a bibliographic database and a digital library of Open Access journals, supported by the Universidad Autónoma del Estado de México with the help of numerous other higher education institutions and information systems.
CORE is an interdisciplinary open access repository for the humanities. Scholars can deposit their course materials, white papers, conference papers, code, digital projects.
PubMed Central is a full-text, open access database with articles from the biomedical and life science disciplines. PubMed Central is administered by the National Library of Medicine .
MedRxiv (pronounced "med-archive") is a free online archive and distribution server founded by Cold Spring Harbor Laboratory (CSHL), Yale University, and the BMJ. Included are complete but unpublished manuscripts (preprints) in the medical, clinical, and related health sciences.
bioRxiv is modeled after ArXiv, this repository is a pre-print archive for the biological sciences. Administered by Cold Spring Harbor Laboratory.
SocOpen is dedicated to opening up social science, to reach people more effectively, to improve our research, and build the future.
DISA (Digital Innovation South Africa) is a freely accessible online scholarly resource focusing on the socio-political history of South Africa, particularly the struggle for freedom during the period from 1950 to the first democratic elections in 1994, providing a wealth of material on this fascinating period of the country’s history.