African American Odyssey Exhibit (Library of Congress)
Black Past: Remembered and Reclaimed (Non-Profit organization supported by the National Endowment for the Humanities)
Digital Library on American Slavery (University of North Carolina)
Frederick Douglass Papers (Library of Congress)
Samuel J May Anitslavery Papers (Cornell University)
Voyages: the Transatlantic Slave Trade (Emory University)
Please also check the African American Studies page, created by Christine Oka.