Catalogues
BASE (Bielefeld Academic Search Engine) is one of the world's largest search engines for scientific web documents. The index comprises over 100 million documents from over 5,000 sources. In about 60% of the documents indexed in BASE, the full texts are freely accessible (Open Access). The BASE search engine is operated by Bielefeld University Library.
TIB Hannover (Leibniz Information Centre for Science and Technology and University Library) is the German National Library of Science and Technology and provides science, research and business with literature and information.
PLOS ONE is an integrative Open Access journal community that works together to promote science for the benefit of society. The published research is multidisciplinary and often interdisciplinary. Over 200 subject areas are covered.
The DOAJ (Directory of Open Access Journals) comprises approximately 12,000 Open Access journals from all areas of science, technology, medicine, the social sciences and the humanities.
Academia.edu ist eine Plattform für Wissenschaftler zum Austausch von Forschungsarbeiten. Es muss sich einmalig mit einer E-Mail Adresse registriert werden. Die kostenfreie Nutzung beschränkt sich auf einzelne Angebote von Academia.
The German Digital Library (DDB) provides free access to Germany's cultural and scientific heritage via the Internet.
