Compiled by the Getty Research Institute, TGN is a structured vocabulary developed primarily for the field of art history, but can be used in any in many other applications. The thesaurus contains nearly 1 million place names representing approximately 900,000 places.

Database of country names in Finnish, Swedish, Saami, English, French, German and Russian.

A database of place-names from the classical Greek and Roman sources, with comments on their etymology, in English, plus toponymy of the Abruzzese Appennine in Italian.

United Nations Group of Experts on Geographical Names. Contains information and resolutions on the issue of place names.