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What websites provide downloadable archives (similar to SE's data dump) of user-generated content under liberal licenses (e.g. creative commons)?

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Can you clarify what you mean by a data dump? – neilfein Aug 23 '10 at 22:03
. . Done . . . . – Gelatin Aug 23 '10 at 23:59

Wikipedia (and sister projects): Dual licensed under GFDL and CC-BY-SA 2.5.

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Planet.OSM has geo-spatial data.

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Freebase: [...] distributed, like Freebase itself, under the Creative Commons Attribution (CC-BY) license and use is subject to the Freebase Terms of Service. If you include the data from these data dumps in a website or application, you must attribute us as described in the Freebase Licensing Policy.

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Open Directory project (DMOZ): Own license with attribution required.

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Airport, airline and route data of Open flights: ODBL

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