ScopusA huge index covering publications from 5,000 publishers in all areas of science, technology, medicine, and social sciences. It has several functions that allow searchers to personalise it to their own interests. You can set up email alerts for this database.
SPIE Digital LibraryThe SPIE Digital Library is the most extensive resource available on optics and photonics, providing access to technical papers from their journals and conference proceedings from 1990 - present.
SpringerLinkAccess to Springer and Kluwer journals, books, series, protocols (1980 - 2012), reference works, and proceedings.