Seconds Pro
Seconds pro is a good app with multiple uses 
teachers, it can use as a countdown, workout
announcer and can provide entertaining music
for students.

Goggle forms
Google forms is a tool used to make surveys test and quizzes for your students. Forms works with most services like sheets , slides, and docs. It can be easily used on computers, phones and tablets and across all major companies whether it be apple or android. 

Second pro app

Google Forms

Nearpod
Nearpod provide real-time insights into student
​ understanding through interactive lessons,
​interactive videos, gamification, and activities. 
and can be done in a single platform

nearpod