The American Presidency Project consolidates, codes, and organizes into a single searchable database: The Messages and Papers of the Presidents: Washington - Taft (1789-1913); The Public Papers of the Presidents: Hoover to Bush (1929-1993); The Weekly Compilation of Presidential Documents: Clinton - G.W. Bush (1993-2007). The archive contains over 72,000 searchable documents on the American presidency including Executive Orders; State of the Union addresses; Proclamations; State of the Union Messages; Press Conferences; Inaugural Addresses; Saturday Radio Addresses; Addresses to Congress; Addresses to Nation and more.
American President: A Reference Resource
From the Miller Center at the University of Virginia, a nonpartisan institute "that seeks to expand understanding of the presidency, policy, and political history, providing critical insights for the nation’s governance challenges." Includes essays, speeches, bibliographies, links to presidential papers, and information on access to private and public papers.
119,000 searchable documents, fully annotated, from the authoritative Founding Fathers Papers projects.