Por si algún profe quiere investigar sobre estas 70 apps y ver si le son de utlidad. Yo uso algunas // The 70 Best Apps For Teachers And Students - Edudemic. These are listed as itunes apps, but I'm sure a lot of them can be found for Android as well.
Playful Learning: 9 Apps for Young Scientists. These are great because you can integrate technology into your science lesson. The students can enjoy a game every so often and not know they are learning at the same time :-)