There are a number of federal grant resources. Federal agencies post grant information and grant guidelines specific for grants they fund on their websites. Here is a partial listing of federal agencies that offer sponsored project opportunities:
National Science Foundation (NSF)
- NSF Grants and Funding Page - Search for funding opportunities
 - NSF Guide to Programs
 - NSF Program Announcements and Information
 - NSF Proposal and Award Policies/Procedures Guide
 - NSF Guide to Proposal Writing
 - NSF FastLane Page
 - NSF Contact Directory
 
National Institutes of Health (NIH)
- 
NIH Grants and Funding Page - Search for funding opportunities
 - NIH Grant Application Basics
 - NIH Forms and Applications
 - NIH Modular Research Grant Applications
 - NIH Contact Directory
 - NIH Institutes, Centers and Offices Directory
 
Federal Funding Agencies
- Air Force
 - Army Research Office
 - Bureau of Democracy, Human Rights and Labor
 - Bureau of Educational and Cultural Affairs
 - Centers for Disease Control and Prevention
 - Defense Advanced Research Projects Agency (DARPA)
 - Department of Agriculture
 - Department of Commerce
 - Department of Defense
 - Department of Education
 - Department of Energy
 - Department of Health and Human Services
 - Department of Housing and Urban Development
 - Department of the Interior, National Park Service: History and Culture
 - Department of Justice
 - Department of Labor
 - Environmental Protection Agency
 - Federal Business Funding Opportunities
 - Institute of Museum and Library Services
 - The Intelligence Advanced Research Projects Activity (IARPA)
 - Internal Revenue Service
 - National Aeronautics and Space Administration
 - National Archives
 - National Endowment for the Arts
 - National Endowment for the Humanities
 - National Human Genome Research Institute
 - National Institute of Justice
 - National Oceanic and Atmospheric Administration
 - Naval Postgraduate School
 - Office of Naval Research
 - Substance Abuse and Mental Health Services Administration