The Government Printing Office's data portal, FDSys, is a major pillar of US government transparency and access to information. Information from all three branches of government is distributed freely and on tremendous scale, often in machine-readable form. They provide the official text of all bills in Congress. They provide the official source of data on all regulatory activity, the Federal Register. They are trying to grow into an official source for federal court opinions. They're adding new things all the time.