CityZen is: a detailed world map showing all political borders - a place name database with over 3,300 entries - a built-in geography quiz with lots of options - completely free, and only 159k in size.
Maps are built from an outline database containing over 20,000 line segments. The pen or the hardware buttons are used to zoom and pan the view and different combinations of place names (countries, capitals, cities, islands, oceans and lakes) can be shown as desired.
The Quiz Mode can generate a variety of multiple-choice quizzes such as `capitals of the world', `countries of Europe', 'islands in Asia', `cities in Brazil' and so on.
A list of all place names in alphabetical order can be used to find places given their names. It can browsed and searched in several different ways.