Padlet - Visual boards for organizing anything.
Kahoot! - Kahoot! makes it easy to create, play and share fun learning games in minutes—for any subject, in any language, on any device.
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.
Sli.do - Slido is the ultimate Q&A and polling platform for live and virtual meetings and events. It offers interactive Q&A, live polls and insights about your audience.
Quizlet - Quizlet allows you to review and create flashcards for a variety of subjects, such as math and reading.
Mentimeter - a web-based polling tool for workshops, conferences & events