Base Bielefeld Academic Search Engine BASE is one of the world's most voluminous search engines especially for academic open access web resources. Base discloses web resources of the "Deep Web", which are ignored by commercial search engines or get lost in the vast quantity of hits.
Google Scholar Powered by Google, this search engine makes it easy to find papers, abstracts, citations and other scholarly literature.
iSeek Designed specifically for students and educators, iSEEK is a non-commercial search engine that delivers editor-reviewed results from universities, government sites and other noncommercial providers.
Infotopia Academic search engine accessing trusted websites selected by educators and librarians.