Search and/or Browse Free Government Sites
In addition, the government provides many sites for specific information that you can easily find by adding the .gov domain to the subject. For example:
Find a list of the many apps available from federal government web sites.
Of special interest: The Writer's Guide to Government Information is a blog entry with links to a wide variety of government sites for detailed information about military history, health, geographical settings, crime, and many other topics of use in particular for fiction writers. Credit: Daniel Cornwall, Alaska Division of Libraries, Archives, and Museums.