GeoRef
The American Geosciences Institute's index — the core database for the earth sciences.
Tier 3 AcademicSubscription
Research Database Directory
Every research database, reviewed.
SciFinder (CAS)
Chemistry's authoritative discovery tool — substances, reactions, and the literature, from CAS.
Tier 2 AcademicSubscription
Reaxys
Elsevier's chemistry database — excerpted reaction, substance, and property data for research and synthesis.
Tier 2 CorporateSubscription
SPORTDiscus
The core index for sports, exercise, and sports-medicine research.
Tier 3 AcademicSubscription
PhilPapers
The comprehensive, community-curated index and archive of philosophy.
Tier 2 Open AccessFree
EconLit
The American Economic Association's index — the curated standard for economics literature.
Tier 2 AcademicSubscription
Project MUSE
Full-text humanities and social-science journals and books — a nonprofit complement to JSTOR.
Tier 2 AcademicSubscription
CNKI
China's largest research database — journals, theses, and more, and often the only route to Chinese scholarship.
Tier 2 CorporateSubscription
Ovid
Wolters Kluwer's search platform — one rigorous interface over many biomedical databases.
Tier 2 CorporateSubscription
SciELO
The open-access library of Latin American, Caribbean, and allied science — free, full-text, multilingual.
Tier 2 Open AccessFree