Declassified Files

US National Archives
Most archival records held by NARA are available to the public for research and are either unclassified or declassified

CIA Freedom of Information Database

Central Intelligence Agency (CIA) Freedom of Information Act (FOIA) Electronic Reading Room.

National Security Archive

George Washington University. The world's largest non-governmental collection according to the LA Times.

UCB Library

Government Information Library - University Colorado, Boulder - extensive list by agency and department.

FBI FOIA Library

FBI's FOIA Library, containing 6,700 documents.

OpenNet Database

OpenNet database with 485,000 bibliographic references and 140,000 recently declassified documents.

NSA Library

National Security Agency released documents.

UK National Archives

Intelligence and security service released files.