In English Language Books
Arxiv: database of Physics
AGRIS: Agricultural Database
Analytical Science Digital Library (ASDL)
Astrophysics Data System (Astrophysics, Geophysics, Physics)
BASE: Bielefeld Academic Search Engine (Multidisciplinary)
Bioinformatic Harvester
ChemXSeer: database of Chemistry
CHBD: Circumpolar Health Bibliographic Database (Medicine)
CiteSeerX (Science)
CogPrints: Cognitive Sciences Eprint Archives
CERN Document Server
EconBiz
ERIC: Educational Resource Information Center
SciTech Connect: Department of Energy Scientific and Technical Information
Mendeley (Multidisciplinary)
OAIster (Multidisciplinary)
OpenGray (Multidisciplinary)
PhilPapers
POPLINE (Population,Family Planning,Reproductive Health)
PubChem (Chemistry)
PubPsych (Psychology)
RePEc: Research Papers in Economics
SafetyLit (Injury prevention literature)
SPIRES-HEP
WorldWideScience
