"This free search engine searches the free full-text of over 400 online law reviews and law journals, as well as document repositories hosting academic papers and related publications such as Congressional Research Service reports."
Developed by the Legal Information Institute at the Cornell Law School, this site allows you to easily search Supreme Court decisions in a variety of different ways. You can also search for opinions by state courts and federal courts.
"Wex is a free legal dictionary and encyclopedia sponsored and hosted by the Legal Information Institute at the Cornell Law School. Wex entries are collaboratively created and edited by legal experts."