KAHOOT

Kahoot is a game based classroom response system played by the whole class in real time.

It gives options to create quizes,surveys,and discussions.

Questions on the screen can be answered by the students via their smartphones,tablets,or computers.

Here is a view from Kahoot,and a sample quiz about linguistics prepared by me.
My quiz link

SOCRATIVE

Socrative is a formative assessment tool which visualize student understanding.
It allows instructors to create quick,simple quizes to engage the attention of students.
Students are able to take the quizes quickly on laptops or mobiles. 
In addition,it is as simple as Kahoot.

If you want to learn more about Socrative,please click here! :)

(This is a view of socrative and a sample quiz that I've prepared on my socrative account.)