DATA.gov

Please visit DATA.gov. This is "to increase public access to machine readable datasets generated by the Executive Branch of the Federal Government" You can search the database by category and agency(source: govdoc-l).

OpenJurist.org

is an open access database to US Supreme Court and Federal Applellate opinion. It includes the Federal Reporter-US Court of Appeals and US States Reports-US supreme Court Cases. Please see whether this is a good fit for your online research guide: http://openjurist.org (source; govdoc-l).