The term case law refers to law that comes from decisions made by judges in previous cases. Case law, also known as “common law,” and “case precedent,” provides a common contextual background for certain legal concepts, and how they are applied in certain types of case. How much sway case law holds may vary by jurisdiction, and by the exact circumstances of the current case.
Justia is one of several websites that gather free legal data. Here is their page for Case Law, which links to federal and every state. Search goes out to web (that is, is does not search the various state case law sites on the list). Click out to each site and see what search options it gives.
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Free law project from Cornell’s Legal Information Institute (LII), Chicago-Kent College of Law and Justia.com, is a multimedia archive devoted to making the Supreme Court of the United States accessible to everyone.