Gapminder -

 

Gapminder is a non-profit venture – a modern “museum” on the Internet – promoting sustainable global development and achievement of the United Nations Millennium Development Goals. 

 

Google Public Data - 

 

Google collects, organizes, and visualizes public data.

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National Geographic Virtual Library -

 

Search for articles, images, maps and advertisements found in National Geographic from 1888 to 1994. 

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World Factbook -

 

The World Factbook provides information on the history, people, government, economy, geography, communications, transportation, military, and transnational issues for 267 world entities.