• Open access to 1,004,673 e-prints in Physics, Mathematics, Computer Science, Quantitative Biology, Quantitative Finance and Statistics Subject search and browse, http://arxiv.org/

Μαθηματικά

• MathWebSearch is a complete system capable of crawling, indexing and searching mathematical data, https://trac.mathweb.org/MWS/wiki/SystemDescription

Επιστήμες Υπολογιστών, Πληροφορικής, Τηλεπικοινωνιών

• CiteSeerx is an evolving scientific literature digital library and search engine that has focused primarily on the literature in computer and information science, http://citeseer.ist.psu.edu/index;jsessionid=CE8F095651C7C2F287F87DF758EAA8EC

Φυσική

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Χημεία

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Γεωεπιστήμες και Επιστήμες Περιβάλλοντος

• The Strategic Guide to Quality Information in Biology, Climate Change, Medicine, and Psychology space, http://www.strategian.com/

Βιολογικές Επιστήμες

• The Biodiversity Heritage Library works collaboratively to make biodiversity literature openly available to the world as part of a global biodiversity community, http://www.biodiversitylibrary.org/Default.aspx
• Bioline International is a not-for-profit scholarly publishing cooperative committed to providing open access to quality research journals published in developing countries, http://www.bioline.org.br/
• The Strategic Guide to Quality Information in Biology, Climate Change, Medicine, and Psychology space, http://www.strategian.com/

Άλλες Φυσικές Επιστήμες

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