The poorly named, but nonetheless worthwhile Free Poverty website is similar to Free Rice.  The difference is that the game at Free Poverty is not based on vocabulary, but rather knowledge of world geography.  It’s very similar to the Traveler IQ game that was popular on Facebook a little while ago.  They also don’t donate rice, but water.  Try it out.  A word of warning: Don’t try to click and drag the map.  The focus of the map will shift automatically to include the place you’re looking for.   I lost two lives right off the bat because of that.  I blame Google for making me think that every map can be manipulated.