National Archives and Records Administration - Features a guide for genealogy researchers (includes upcoming workshops and events, templates, and research tools), and a guide to records specific to African Americans.
Maryland State Archives - Features a guide for genealogy researchers, a guide to records specific to African Americans, a database of records and website about slavery in MD, additional images of primary resource records, and Baltimore City Freedom Records.
Library of Congress - Local History and Genealogy Reference Services - Features guides for genealogy researchers and digitized collections pertaining to U.S. History (e.g. Slavery and Law, Slave Narratives, African American Pamphlets).
Digital Maryland - Includes collections such as the African American Funeral Programs, Manumissions, Indentures, Bills of Sale , Mapping Maryland's Counties, Slave Documents, and Views of African American Life in MD.
Maryland Historical Society - Features a guide for genealogy researchers, as well as one specific to resources they offer about African Americans.
Afrigeneas - Features user submitted resources (slave data collection; photographs; census, death and marriage records), and communal features (mailing lists, option to create an email account, message boards, daily and weekly chat).
Trans-Atlantic Slave Database - Information on over 35,000 slaving voyages that occurred between 1514 and 1866, manipulable into maps, timelines, tables, and graphs. Includes African Names Database, recommended websites, essays to provide context, and images (manuscripts, places, slaves, and vessels).
Free African Americans of Virginia, North Carolina, South Carolina, Maryland, and Delaware - Listing of free African Americans in the Southeast during the colonial period extracted from primary source materials.
African American Genealogy - Enoch Pratt Free Library (prattlibrary.org)