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.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Padlet - Visual boards for organizing anything.
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
Socrative - Socrative helps teachers engage the class with educational activities to measure and visualize...
Slack - A messaging app for teams who see through the Earth!