FunBrain hosts a collection games that elementary school and middle school students can use to practice mathematics and language arts. A few of the games on FunBrain that I tried include Grammar Gorillas, Mad Libs School Rules, and Math Basketball. In Grammar Gorillas students "feed" a gorilla by correctly identifying parts of speech. Mad Libs School Rules, like any Mad Libs activity, asks students to fill in the blanks in a story with verbs, nouns, and adjectives. Math Basketball presents students with math problems to solve in order to pass and shoot a basketball.
Applications for Education
The FunBrain games aren't anything special in terms of format or visual effects.
If you're looking for some practice activities for your students then FunBrain is worth taking a look at. The games are arranged into grade level collections.