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!

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.

Slack It - A bookmarklet to share links in Slack with one click

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