ERIC.gov - ERIC is a library of research and information and is sponsored by the U.S. Department of Education.
Google Scholar - A search engine that is free and indexes scholarly literature across a wide variety of publishing formats and disciplines.
ResearchIT CT - Connectict State Library. A research focused portal that contains databases and more for students and staff. A local library card is needed to access items from off campus.
WolframAlpha - A computational search engine. Contrary to a search engine, a computational search engine answers factual queries.