World Factbook for Android

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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FEATURES

* 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)

* Favorites

* No ads

* Works completely offline

NOTES

* 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.

SOURCES

The World Factbook 2014-15. Washington, DC: Central Intelligence Agency (Jan 16, 2014)

https://www.cia.gov/library/publications/the-world-factbook/index.html