Congress.gov is the official website for U.S. federal legislative information. The site provides access to accurate, timely, and complete legislative information for Members of Congress, legislative agencies, and the public. It is presented by the Library of Congress (LOC) using data from the Office of the Clerk of the U.S. House of Representatives, the Office of the Secretary of the Senate, the Government Publishing Office, Congressional Budget Office, and the LOC's Congressional Research Service.
FDsys provides free access to the official publications from all three government branches. These documents are authenticated, PDF versions of the official publications.
Proquest Congressional offers a comprehensive collection of congressional documents from 1789 to the present, including House and Senate Documents/Reports, Congressional Record, legislative histories, CRS Reports, hearings, etc.
The Congressional Record includes debate on legislative bills on the floor of the House or Senate.
FDsys (1994-current) both Daily and Permanent editions.