One of the Sloan Foundation's major program areas, Digital Information Technology, has funded Digital Public Library of America, Wikipedia, the Internet Archive, and other projects that increase digital access to knowledge.
The Mellon Foundation's grant-making includes an area in Higher Learning includes support for "develop the interpretive tools and methods scholars use to create meaning."
Grant Resources at UW
Ellen Jacks, the Grants Librarian at University of Wisconsin-Madison Libraries, is an excellent resource for your questions related to finding and applying for grants funding. She also maintains several research guides that can help you with grant proposal writing, finding federal funding, and other topics.