Vici.org

Vici.org is a geographic resource for the Roman world, collecting and publishing point-data about settlements and relevant places.

The licence:

All content on Vici.org is published under the Creative Commons Attribution-ShareAlike 3.0 (CC BY-SA 3.0) license. It may be shared, adapted or commercially used under the condition that a reference with link to http://vici.org/, or to the relevant page on Vici.org, as the source is provided. If you alter, transform, or build upon this work, you may distribute the resulting work only under the same or similar license to this one.