World Wide Science

World Wide Science is a global science gateway — accelerating scientific discovery and progress through a multilateral partnership to enable federated searching of national and international scientific databases. Databases you can search simultaneously include the Canada Institute for Scientific and Technical Information and Science.gov (US).

Intute: Science, engineering & technology

Intute: Science, engineering & technology is a free online service providing you with access to the very best Web resources for education and research, evaluated and selected by a network of subject specialists. It covers the physical sciences, engineering, computing, geography, mathematics and environmental science. The database currently contains 33696 records.

PLoSONE

PLoS ONE is an international, peer-reviewed, open-access, online publication which features reports of primary research from all disciplines within science and medicine.