Twist - Check fewer notifications, do more meaningful work. Twist is the team communication app for calmer, more organized, and more productive teamwork.
P2 - Share, discuss, and collab with your team. By Wordpress.
Slack - A messaging app for teams who see through the Earth!
Wait.chat - Deadline-aware message inbox for async teams
Public - Group chats.
Peoplebox - Peoplebox helps managers have meaningful 1-on-1s, get continuous feedback, review performance in real-time and take critical actions that matters.