World's largest academic search engine providing free searching to a full range of scholarly literature (ie. peer-reviewed papers, theses, books, pre-prints, abstracts, technical reports).
The Child Welfare Information Gateway is a service of the Children's Bureau, Administration for Children and Families, U.S. Department of Health and Human Services
Covers psychology and the psychological aspects of various other disciplines. Contains citations and summaries of journal articles, book chapters, books, and technical reports, as well as citations to dissertations.
Most comprehensive education index, covering nearly 1000 journals, primarily American. Also indexes ERIC documents, including conferences, curricula, reports etc. ERIC (EBSCO) includes many links to full text.
Nearly 1 million articles from a wide range of social sciences. Some articles, reports, chapters, etc. have not been published in a peer reviewed journal.