The Foundation Directory is the definitive resource when looking for grants.
Included is a searchable database of over 92,000 foundations, corporate giving programs, and grantmaking public charities in the U.S.; a database of nearly 3,700 sponsoring companies, offering a quick pathway to corporate funders; a database of over 1.3 million recently awarded grants; and a keyword-searchable database of over 441,000 recently filed IRS Forms 990 and 990PF.
Foundation Directory Online provides details on U.S. funders and their grants. It offers in-depth information on U.S. grantmakers and their grants, drawn from reliable sources, including IRS 990s, grantmaker web sites and annual reports, plus data provided directly by grantmakers.
Many lists of top fund-raisers, corporate giving, foundation giving, online fund-raising, biggest donors, county-by-county generosity, etc. plus articles on studies by other organizations.