BASE is one of the world's most voluminous search engines especially for academic web resources. BASE provides more than 150 million documents from more than 7,000 sources.
Scholarly and Academic Information Navigator (pronounced like "sigh-knee") is a free database service which can be searched with academic information of articles, Books, Journals & Dissertations.
CORE harvests research papers from data providers from all over the world including institutional and subject repositories, open access and hybrid journal publishers.
The DOAJ (Directory of Open Access Journals) was launched in 2003 at Lund University, Sweden, with 300 open access journals. Today, the independent database contains ca. 12000 open access journals.
JournalTOCs is a Current Awareness Service (CAS) where you can discover the newest papers coming directly from the publishers as soon as they have been published online.
OAPEN works with publishers to build a quality controlled collection of open access books, and provides services for publishers, libraries and research funders in the areas of deposit, quality assurance, dissemination, and digital preservation.
Project MUSE promotes the creation and dissemination of essential humanities and social science resources through collaboration with libraries, publishers, and scholars worldwide.