The 1860 United States Slave Census - in the process of being digitized; currently available for download (requires Microsoft Excel)
The 1947 Partition Archive - a non-profit non-governmental organization dedicated to documenting, preserving and sharing eye witness accounts from all ethnic, religious and economic communities affected by the Partition of British India in 1947
Americans for Immigrant Justice - records of the not-for-profit legal assistance organization dedicated to protecting and promoting the basic human rights of immigrants of all nationalities; records span the years of 1980-2011
Behind the Veil: Documenting African American Life in the Jim Crow South - A selection of 410 recorded oral history interviews chronicling African-American life during the age of legal segregation in the American South, from the 1890s to the 1950s
The Baltimore Uprising, 2015 - maintained by the Maryland Historical Society, this site is a digital repository that preserves and makes accessible original content captured and created by community members, grassroots organizations, and witnesses to the protests that followed the death of Freddie Gray on April 19, 2015
The Black Archives - documents the exceptional and everyday activities of black South Florida life; includes historical and contemporary records
Collective Punishment - an interactive map documenting mob violence, riots, and pogroms against African American communities (1824 - 1974)
Digital Southern Historical Collection - maintained by UNC-Chapel Hill,  a large-scale digitization program that is designed to provide online access to entire manuscript collections or to substantial portions of collections; see also their Portal for African American Documentary Resources that are part of the collection
The Eugenics Archive - chronicles how U.S. dealt with mental illness and other "dysgenic" traits
Freedman & Southern Society Project - a collection of more than 50,000 documents that explain how black people traversed the bloody ground from slavery to freedom between the beginning of the Civil War and the start of Radical Reconstruction
Free the Law Project - sponsored by Harvard University Law Library, Free the Law is making all U.S. case law freely accessible online 
Guantanamo Public Memory Project - seeks to foster intense and ongoing debates over critical issues around “remembering” Guantánamo; steered by Columbia University's Institute for the Study of Human Rights
Gulag: Many Days, Many Lives - online exhibit and archive that immerses viewers in the history of the Soviet Union's vast system of labor camps
History is a Weapon - a repository of important historical artifacts, documents and records focusing on U.S. history; this website was created by Howard Zinn's students and collaborators from his work A People's History of the United States
Human RIghts Library - maintained by the University of Minnesota; includes digitized material on a wide assortment of domestic and international human rights issues
The Mary Turner Project - a grassroots collective of students, educators, and community members dedicated to research-driven community engagement, the project includes a searchable database and collection of primary sources related to lynching
MurderPedia: The Encyclopedia of Murderers - free online encyclopedic dictionary of murderers and the largest 
database about serial killers and mass murderers around the world
O Say Can You See - reconstructs the social world of early Washington, D.C., especially its multigenerational family networks, by collecting, digitizing, making accessible, and analyzing legal records and case files between 1800 and 1862 (includes hundreds of 'freedom suits' filed by enslaved persons)
Papers of the War Department (1784 - 1800) - a digital archive that unites copies of files from the early U.S. War Department, whose records were destroyed by a fire in 1800 
Police Violence and Killings in the United States - a collection of sites that offer data stretching back to the 1990s on officer-involved shootings, deaths, and use of excessive force
The Schomburg Center for Research in Black Culture - part of the New York public library system, the Schomburg's online collections are extensive and include digitized Green Books and other rare texts, prints, and images
Still Present Pasts: Korean Americans and the "Forgotten War" - a multi-media exhibit of installation and performance art, documentary film and archival photographs, and oral histories that explores memories and legacies of the Korean War
Until Safety is Guaranteed: Women and the Fight Against Violence - provides historical evidence on the topic of gender violence and documents the experiences of women who have survived domestic abuse and sexual violence
The Valley of the Shadow: Two Communities in the American Civil War - details life in two American communities, one Northern and one Southern, from the time of John Brown's raid through the era of Reconstruction