Google Scholar


A search engine for scientific publications from many disciplines and sources: articles, theses, books, abstracts and court opinions, from academic publishers, professional societies, online repositories, universities and other web sites. Bibliographic records can be exported to reference managers, eg. Mendeley.


FreeFull PDF


A free PDF search engine for scientific publications. It includes over 80 million free science papers, patents, theses and posters.







 A free, medically-focused deep web search engine.



Science Research


A free, publicly available deep web search engine.




 World Wide Science


A global science gateway comprised of national and international scientific databases and portals.




 A search engine for scientific publications by a DOI name (Digital Object Identifier).





HON / Health on the Net


OpenDOAR / academic Open Access Repositories


ROAR / Registry of Open Access Repositories



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