Outline Maps offers a free set of geography games. The site contains games about Africa, South America, Europe, the United States, and the world. There are two basic types of games on the site. The first type, "find by name," displays a state, country, or city name and you have to click the map to identify that place. The second type of game, "find by feature," highlights a location and you have to type the name of the highlighted location.
Applications for Education
Outline Maps is simple set of games that you could use in an elementary school or middle school setting to help students learn the names and locations of countries and states. The site is a little short on decorative graphics that you will find on other game sites, but I kind of like the minimalist style of Outline Maps.
H/T to Maps Mania.