Rome Reborn - view 3D digital models of ancient Rome; a collaboration between Virtual World Heritage Laboratory of the University of Virginia, the UCLA Experiential Technology Center, the Reverse Engineering Lab at the Politecnico di Milano, the Ausonius Institute of the CNRS and the University of Bordeaux-3, and the University of Caen
Bodleian Library - Oxford University's collection of digitized manuscripts to the year 1500. Hint: use ctrl+f to search for texts in Latin
British Library - the British Library's collection of digitized manuscripts. Search by keyword, title, manuscript, author, and acquisition
The Oxford Encyclopedia of Ancient Greece & Rome - a comprehensive overview of the major cultures of the classical Mediterranean world—Greek, Hellenistic, and Roman—from the Bronze Age to the fifth century CE
The Oxford Dictionary of the Classical World - this accessible and wide-ranging reference work draws on the groundbreaking Oxford Classical Dictionary to present more than 2,500 entries on the civilizations of ancient Greece and Rome