Backchannel Chat - Backchannel Chat is best in class discussion tool that is intended for teachers to streamline their class activities.
BookWidgets - BookWidgets is an excellent application that let you create engaging exercises in minutes and easily share a varied variety of beautiful and fun activities with your classroom and others.
NowComment - NowComment is a complete suite of collaboration tools, streamlining group discussion, annotation, and curation of texts, images, and videos.
Padlet - Visual boards for organizing anything.
Eduflow - Digital learning that actually teaches students something
Quizlet - Quizlet allows you to review and create flashcards for a variety of subjects, such as math and reading.