Grants.gov. Grants.gov is "the single access point for over 1000 grant programs offered by all Federal grant-making agencies". Not every grant is announced through Grants.gov yet, but most are. Grants.gov allows you to register for email notification of grant opportunities. How does Grant Spy compare to Grants.gov?
DUNS numbers. All applicants for federal grants are required to have a Dun and Bradstreet Data Universal Numbering System (DUNS) number.
Healthy Youth Funding Database. The Centers for Disease Control & Prevention provides a Healthy Youth Funding Database which contains active information about funding opportunities for adolescent and school health programs. These funding opportunities are from federal agencies and the private sector. Each funding opportunity is carefully selected based on its relevance to adolescent health, or one or more of the eight components of a Coordinated School Health Program as defined by the CDC.
GrantSmart. GrantSmart publishes IRS Forms 990 filed by private foundations and charitable trusts, which can provide useful information about the organization's funding history.
Council on Foundations. Community Foundation Locator
League of California Community Foundations. Community foundations in California
Federation of State Humanities Councils. 56 State Humanities Councils
GuideStar. A growing number of foundations require applicants to establish a record on GuideStar. Ostensibly, GuideStar provides information about nonprofits, but very little of it is available without a paid subscription.
THOMAS. The Library of Congress's THOMAS website is designed to "make federal legislative information freely available to the public."
ActivistCash. "ActivistCash.com, a project of the Center for Consumer Freedom, provides the public and media with in-depth profiles of anti-consumer activist groups, along with information about the sources of their exorbitant funding." Note: ActivistCash.com has a very right-wing bias.
Funding Universe. This collection of Company Histories can be useful for development professionals seeking to learn about family wealth.
Better Business Bureau. The BBB warns: "Free cash grants are too good to be true". Search the BBB's website for complaints made against unscrupulous merchants.