Social Sciences Premium Collection is a core resource for research in the social sciences. Provides citations, abstracts, and full-text, along with dissertations, books and book chapters, and association papers.
Academic Search Premier is a good interdisciplinary database of citations, abstracts, and full-text of scholarly journals, magazines, and newspapers.
Psychology
PsycINFO is the best database for psychology research. It indexes and provides abstracts for the professional and academic literature in psychology and related disciplines (psychiatry, education, linguistics, neurosciences, etc.) and is produced by the American Psychological Association.
Sciences
Web of Science is a multidisciplinary database that indexes major journals in the sciences and social sciences, and is especially useful to find who cited an article after it was published.
PubMed citations and abstracts include the fields of biomedicine and health, covering portions of the life sciences, behavioral sciences, chemical sciences, and bioengineering.
Education
Education 3-in-1 Articles Search provides a combined search of three of the best databases for education research: ERIC, Education Source, and Academic Search Premier.
Health
Global Health is a public health database that identifies research and scholarship on all aspects of public health, including international health.