Slack

Slack is a collaboration hub for work, no matter what work you do. It’s a place where conversations happen, decisions are made, and information is always at your fingertips. With Slack, your team is better connected.

https://slack.com/

Slack is one of those do it all tools. I ran a website for a little while with some friends of mine, and the abilities we had, to share, discuss, and keep tabs on who was working one what and when was absolutely fantastic. To the point where once they were done, they jumped out and continue to use Slack in their own side projects with other teams. It’s an amazing tool that makes working (especially long distance, you distance ed students) so easy.