Slack

Group chat, one-on-one messaging (Direct Message), and more are available.
For more information, please click here.

Zoom

Zoom is a cloud service that enables web conferencing and online classes, and is a "video and web conferencing service" that allows multiple people to participate at the same time.
For more information, please click here.

Teams

Teams is a tool that provides a workspace for facilitating team activities.
For more information, please click here.