Though not technically a gov doc, this open access project is an excellent ongoing initiative about American Slavery and the projects aim "to reframe the country’s history by placing the consequences of slavery and the contributions of black Americans at the very center of our national narrative."
This HeinOnline collection brings together a multitude of essential legal materials on slavery in the United States and the English-speaking world. This includes every statute passed by every colony and state on slavery, every federal statute dealing with slavery, and all reported state and federal cases on slavery. Much of the non-legal material in this collection is based on the magnificent holdings of the Buffalo Public Library. Its rare book collection contains hundreds of nineteenth century pamphlets and books on slavery.
brings together essential periodicals, compiled legislative histories, CRS reports, Congressional hearings, United States Supreme Court briefs, monographs, and other related materials on the difficult and controversial topic of regulating firearms in the United States.
From April 2005 to June 2018, Alan Zoellner of William & Mary kept a blog of recently released government documents. This archive is searchable by keyword and provided categories. His last entry was June 21, 2018 about the Presidential Executive order that ended the policy of separating immigrant parents and children.