Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
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.
Clockify - Simple and free time tracker. Perfect for small and mid-sized businesses as well as freelancers. Unlimited projects and users, unlimited productivity. Get all the premium functionalities, completely free.
Padlet - Visual boards for organizing anything.
Cattr - Cattr is a free open-source self-hosted time tracker with desktop clients for windows, mac, linux.
Quizlet - Quizlet allows you to review and create flashcards for a variety of subjects, such as math and reading.