Twist - Check fewer notifications, do more meaningful work. Twist is the team communication app for calmer, more organized, and more productive teamwork.

Public - Group chats.

P2 - Share, discuss, and collab with your team. By Wordpress.

Chalk - Chalk is a calculator that tries to do right what others do wrong.

Wait.chat - Deadline-aware message inbox for async teams

chitchat - Chat Room with Selfies and Pagers (yes, pagers!)