National Endowment for the Humanities: The largest funder of humanities programs in the U.S.
National Endowment for the Arts: Awards grants to nonprofits and state/regional arts organizations for performance and visual arts, exhibitions, creative writing, and art-related research. Search their database of awards given since 2000 at http://apps.nea.gov/GrantSearch/.
Grants.gov: The federal government's application clearinghouse for grant applications. These grants should all be included in Pivot, but you may need to apply here.
Guggenheim Memorial Foundation: Sponsors 6-12 month fellowships for mid-career scholars and creative artists.
American Council of Learned Societies: Sponsors a number of fellowships for research, collaborative research, digital innovations, post-doc public fellows, and specialized areas such as American art and Buddhism. Does not fund creative work, textbooks, translation, or pedagogical projects.
National Humanities Center: Offers 40 residential fellowships for scholars at all levels, although a record of publication is required.
Georgia Humanities Council: Awards grants to nonprofit organizations for programs such as literary events, film or lecture series, historical tours, exhibitions, community forums, oral history projects, historic markers and workshops. Does not fund the performing arts.
Cornell Fellowships Database: Searches fellowships worldwide.