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.

Padlet - Visual boards for organizing anything.

Popplet - Popplet is the simplest application to capture and organize your idea.

Socrative - Socrative helps teachers engage the class with educational activities to measure and visualize...

Quiver - Quiver is a notebook built for programmers.

Quizlet - Quizlet allows you to review and create flashcards for a variety of subjects, such as math and reading.