The University of Virginia Press has started a new open access publication called
Founders Early Access. It contains 5 thousand previously unavailable documents concerning James Madison and John Adams. I've looked through the list, and it's mostly letters to and from the principles.
UVA's other digital records require fees ranging from
$200 to $7300 to access, and UVA is requiring a
license agreement. They're actually trying to claim copyright on works written 200+ years ago. How ridiculous.