BitSavers is a preservation archive of documentation and software for vintage computers. It is run by Al Kossow, who is the software librarian for the Computer History Museum. BitSavers is a wonderful resource for both historians and collectors of vintage computing. You can subscribe to an RSS feed for the documentation or an RSS feed for the bits to be made aware of new additions to the archive. Two recent additions to the archive shed some light on early computer graphics products.
Recent Additions to BitSavers