Early English Books Online (EEBO) - almost all works in English printed from 1473-1700.
Cambridge Digital Library - Cambridge’s digital collections encompass a huge range of MS and print material from across the globe, including early printed books.
Folger Library Digital Image Collection (known as LUNA) - the Folger’s general digital database for their printed and MS collections.
Harvard Digital Collections - a digital repository of roughly 6 million items, including early printed material.
The Huntington Digital Library - contains digitised copies of early printed books from the Hungtington’s collection.
UCL Digital Collections - digital images of UCL’s early printed books.
Medieval Mosaics - this site gives information about different medieval mosaics around the world.