World Factbook provides information on the history, people, government, economy, geography, communications, transportation, military, and transnational issues for 267 world entities.
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* Country profiles and country comparisons
* Both phone and tablet interfaces
* Detailed flags and maps (requires a free Flags & Maps add-on from Play Store: http://goo.gl/WQ7Bcp)
* No ads
* Works completely offline
* The app does requests access to internet to automatically report possible errors or warnings. Of course, if internet is not present it'll continue working.
* It also requires about 15 megabytes of additional space for internal database to be unpacked.
The World Factbook 2014-15. Washington, DC: Central Intelligence Agency (Jan 16, 2014)