Minecraft: Education Edition is an open-world game that promotes creativity, collaboration, and problem-solving in an immersive environment where the only limit is your imagination. It allows you to collaborate, document, and experiment different lessons in a secure server with your class with lesson plans provided for every discipline and age range.

https://slack.com/
A collaborative tool for people in the same spheres that want to share information, broadcast information, or give the different parts of their teams a dedicated space to work in.