FDsys
This service of the Government Printing Office, provides access to a wide range of government publications and data including: the U.S. budget, the Code of Federal Regulations, Presidential documents, Congressional bills, documents, hearings and reports, the Congressional Record, the Constitution, economic Indicators, the Federal Register, public and private laws, the United States Code, and federal court opinions.
Congress.gov
This site has replaced THOMAS.gov. It is user-friendly, mobile-friendly, and provides layered search options. Find public laws, pending bills, committee reports and hearings. It also provides access to the full text of legislation from 1989 (101st Congress) to the present.
U.S. House of Representatives
A searchable version of the most recent version of the U.S. Code. The website also provides access to session laws.
USA.gov
This website offers a wealth of federal government information including links to the websites of departments, agencies and branches of government, which can be a good source for statutory and legislative materials.