JSTOR has expanded their free read-online access from the usual six articles per month to 100 articles per month through June 30, as well as additional expanded access for those who have paid accounts (such as through an academic institution). Learn more at this link.
The Gilder Lehrman Institute of American History has opened some of their resources for families and teachers for free. It includes study guides, lesson plans, and lectures but also includes access to 70,000+ primary source documents from their collection. Learn more at this link.
Smithsonian did not seem to have additional free resources but they still have a great online archive collection for research purposes, as well as additional resources for researchers in general. Learn more at this link.
National Archives hasn’t expanded their free access (yet), but they have listed some great virtual programs in a newsletter to help folks take advantage of available resources right from home. Meanwhile, the NA’s social media has stated that behind the scenes, staff have been working on digitizing more of their collection to make it available during their closures. Learn more at this link and follow them on Facebook here.
Looking for additional generic resources? Check these out too:
Constitution.org (great for 18th century!)
And lastly, looking for just something fun and still Rev War related? Mount Vernon has an online game where you get to be George Washington and tackle some of the challenges he faced during the war and as president.