The Foundation Directory is database of over 120,000 private and corporate foundations, their fields of interest, types of support, and information about their funding histories. It largely covers foundations that provide funding for nonprofit organizations, and it includes other types of grants as well. A limited-feature version is available for free, For the full-featured version, organizations can subscribe to it, and Foundation Center members, such as libraries provide it to the public.
Foundation Directory Tutorials
Move on to agency sites
After finding an opportunity in Grants.gov, go to the sponsoring agency's site to find more information. Individual agencies usually have details about their funding opportunities and funding histories in their own searchable databases. These details often don't make it to Grants.gov. An agency's site also has overviews of the types of funding the agency typically provides and of their funding processes that can't be found on Grants.gov.