From the site:
"The geonames.org geographical database is available for download free of charge under a creative commons attribution license. It contains over eight million geographical names and consists of 6.3 million unique features whereof 2.2 million populated places and 1.8 million alternate names. ... The data is accessible free of charge through a number of webservices and a daily database export. Geonames.org is already serving up to over 3 million web service requests per day."
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