• The Directory of Open Access Journals covers free, full text, quality controlled scientific and scholarly journals. 

  • Bielefeld Academic Search Engine is a search engine especially for academic open access web resources. BASE is operated by Bielefeld University Library.

  • A search tool from EBSCO for open access journals and journals in special programs for developing countries.

  • Open Access Publishing in European Networks gives access to open access books in the Humanities and Social Sciences.

  • ROAD provides free access to a subset of ISSN bibliographic records identifying online scholarly resources available in Open Access: journals, conference proceedings and academic repositories.