Philanthropy, Voluntarism and Grantmaking Foundations Organizations in the United States number in the thousands. There are many in each state, including new and fully-established groups. There are currently 18 subcategories of Philanthropy, Voluntarism and Grantmaking Foundations as defined by the National Taxonomy of Exempt Entities. These subcategories include everything from Alliance/Advocacy Organizations to Voluntarism Promotion. Explore the links below to see what these organizations have to offer.