These library databases act as indexes to many thousands of journals. Some include other types of information such as books, patents and conference papers.
EMIS includes zbMATH and The Electronic Library of Mathematics.
Useful websites – subject gateways and search engines: search for reports, grey literature, organisations. This links to the Recommended links tab above.
Journal Metrics – from Elsevier
SciVal - Benchmarking tool for individuals, research groups or insitutions