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Ancient World Mapping Center –
http://awmc.unc.edu/wordpress/research/resources-for-ancient-world-geography/
Pleiades: A community-built gazetteer and graph of ancient places
http://pleiades.stoa.org/
Orbis
The Stanford geospatial network model of the roman world:
http://www.stanford.edu/dept/classics/cgi-bin/web/projects/orbis-stanford-geospatial-network-model-roman-world
The Digital Atlas of Roman and Medieval Civilization (DARMC)
http://darmc.harvard.edu/icb/icb.do
Digital Atlas of the Roman Empire
http://imperium.ahlfeldt.se
Pelagios
http://pelagios-project.blogspot.se/p/about-pelagios.html