You can also try Socrative or Kahoot. None of them was designed solely for the teaching of languages, but they both seem to do a great job in engaging students.
I will learn more about Socrative in May (I will be attending a workshop on it) but I have been going over both Socrative and Kahoot (this was my second option - I had to choose from one of them) and I really like them.
You can find them in:
www.getkahoot.com
This is what you should access as a teacher -play the intro quiz to see how it goes. The only problem I see in Kahoot is that, as far I know, everyone needs to be in the same room in which you need to have the teacher device (which shows the questions and students � answers - I have been using my computer), and a device for each student (any device seems to do - a phone, a tablet, a computer, ...; it just takes accessing www.kahoot.it and log in there using the pin that is displayed by the teacher �s device).
www.socrative.com
Socrative can be played away from the classroom, that is to say, you can schedule a session for a specific time and everyone just has to access it.
To see what it is and how it goes, take a look at:
https://edshelf.com/tool/socrative-teacher/ (this one displays teachers� reviews)
or at
http://www.makingtechsimple.com/socrative (this one explains what it is and how to use it).
Sandra