This is an old post, but one I keep coming back to for new tools to try in the classroom. The Google Tour creator can also be adapted to work on chromebooks. That is one I have wanted to try out for a while as it will put students in the location being talked about. It also encourages self-exploration, allowing students to find things that are meaningful to them.
GeoGuesser is another tool I could see being a great help to the classroom. I know some people who do this for fun in their spare time.