FDsys - Federal Digital System (U.S. Government Printing Office) provides free electronic access to the official versions of many government publications.
Ben's Guide to U.S. Government for Kids "provides learning tools for K-12 students, parents, and teachers. These resources will teach how our government works, the use of the primary source materials of GPO Access, and how one can use GPO Access to carry out their civic responsibilities."
Browse Topics (GPO & Oklahoma State University) -- "Professional librarians from the Federal depository library community have created a browseable list of Federal Web sites based off broad subject areas. Choose a category and then click on a listing to read a detailed description of the services provided by a site."
Federal Agency Directory (GPO & Louisiana State University) -- Browse or search by agency keyword.
MetaLib -- "a federated search engine that searches multiple U.S. Federal government databases, retrieving reports, articles, and citations while providing direct links to selected resources available online."
USA.gov -- "the U.S. government's official web portal" - provides multiple ways to browse or search for information:
For Governments and Government Employees
For Visitors to the U.S.
Florida Government Information Locator (State Library of Florida) -- "a virtual card catalog of government information available on the Internet and beyond. Although the focus of the Locator is information from and about Florida State government, we recognize the relationships between levels of government and include links to local and federal government resources as well."
Links to Top Government Web Sites (FedWorld)
Restrict your search to the URL domains of .gov or .mil with:
University of Michigan Government Information Collection -- "a central reference and referral point for government information, whether local, state, federal, foreign or international. Its web pages are a reference and instructional tool for government, political science, statistical data, and news."