Here is a handy visual that Educational Technology and Mobile learning created based on iTunes collection ‘Teachers’ Favourites’. They say that you will in it « find a number of key iPad apps popular among teachers and educators. The apps are arranged into four main categories: apps for communicating with students and parents, apps for creating quizzes and tests, apps for fostering students creativity, and apps for planning lessons. Two apps that are not in iTunes original collection and which we added to second category are Google Classroom and Edmodo. »
You can download for free in PDF format from here.
Link for the article: http://www.educatorstechnology.com/2017/04/teachers-favourite-ipad-apps.html