Edudemic doesn’t cover Android as much as it deserves so this useful list should be a helpful start. It details 50 useful (and free!) Android apps from Google Play, Google’s online app store. There’s some categorization here so be sure to scroll around to find the right area you’re looking for.
Read more:
http://edudemic.com/2012/10/50-free-android-apps-being-used-in-education-right-now/