(pre-K to 6): This site has versions in 5 languages, and 9 categories of activities, including Games, Learn to Draw, Listen and Reading Comprehension, Learn to Draw the Numbers, and so on. It appears to be predominantly spanish based on the ads that surround the playing area.
(Grades 3 and up) : Karooba is a "social and gaming site that is focused on education", featuring canned and custom developed Quizzes, Trivia and more. You really have to register to get the most out of it