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.

Tettra - Tettra is a company wiki that helps teams manage and share organizational knowledge.

Padlet - Visual boards for organizing anything.

Slinky - Your slack links — organized!

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

Fastgrep - Find and organize your Slack team's links and files