The Fell Types as open-source Truetype fonts by Ignio Marini. So named because they were imported by John Fell of the Oxford University Press, from Holland circa 1670–1672, to bypass government interference in printing. As Propnomicon says, they’re excellent for “faux antique” documents.
After install they turn up not under “F”, but under “I”, as ‘IM Fell Types’.
In the same vein is the display caps font “LP Aspen Cam”, but where you’d obtain it now I’m not sure. It seems to have completely vanished from the web.
[ Hat-tip: Propnomicon ]