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CORE is a multidisciplinary aggregator of open access research. It allows users to search more than 66 million open access articles. While most of these link to the full-text article on the original publisher's site, five million records are hosted directly on CORE.
In addition to a straightforward keyword search, CORE offers advanced search options to filter results by publication type, year, language, journal, repository, and author.
Functioning as a research and publishing network, ScienceOpen offers open access to more than 28 million articles in all areas of science. Although you do need to register to view the full text of the articles, registration is free. The advanced search function is highly detailed, allowing you to find precisely the research you're looking for.
Directory of Open Access Journals
A multidisciplinary, community-curated directory, the Directory of Open Access Journals (DOAJ) gives researchers access to high-quality, peer-reviewed journals. It has archived more than two million articles from 9,519 journals, allowing you to either browse by subject or search by keyword.
Education Resources Information Center (ERIC)
The Education Resources Information Center (ERIC), of the Institution of Education Sciences, allows you to search by topic for material related to the field of education. Links lead to other sites, where you may have to purchase the information, but you can search for full-text articles only.
arXiv e-Print Archive
The arXiv e-Print Archive has been around since 1991 and is a well-known resource in the fields of mathematics and computer science. It is run by Cornell University Library and now offers open access to more than one million e-prints.
OpenDOAR, or the Directory of Open Access Repositories, is a comprehensive resource for finding open access journals and articles. Using Google Custom Search, OpenDOAR combs through open access repositories around the world and returns relevant research in all disciplines.
CIA World Factbook
The CIA World Factbook is a little different from the other resources on this list in that it is not an online journal directory or repository. It is, however, a highly useful research database for academics in a variety of disciplines. All the information is free to access, and it provides facts about every country in the world, including information about history, geography, transportation, and much more.
Paperity boasts being the "first multidisciplinary aggregator of open access journals and papers." Their focus is helping you avoid paywalls while connecting you to authoritative research.