Google Classroom - Learning management tool by Google
Padlet - Visual boards for organizing anything.
Moodle - Moodle is the world's most popular learning management system. Start creating your online learning site in minutes!
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.
Canvas by Instructure - The Canvas LMS is the world's fastest growing learning management system. Check out favorite features and schedule a live demo!
Quizlet - Quizlet allows you to review and create flashcards for a variety of subjects, such as math and reading.