Fasti Online – A database of archaeological excavations since the year 2000.
Pleiades – Geographic info on classical places pulled into Google Maps from the Barrington Atlas and other sources.
Digital Map of the Roman Empire – Created by Johan Åhlfeldt, a researcher at Sweden’s Lund University, who built it using sources including the Barrington Atlas of the Greek and Roman World and the Pleides dataset.
ORBIS – The Stanford Geospatial Network Model of the Roman World reconstructs the time cost and financial expense associated with a wide range of different types of travel in antiquity.
Nestor – Bibliography of Aegean Prehistory and Related Areas. Currently online coverage extends from 1957-2003.