chitchat - Chat Room with Selfies and Pagers (yes, pagers!)
SoChat - Chat with everyone
Chalk - Chalk is a calculator that tries to do right what others do wrong.
nocnoc - Instant group chat invite via link
Talk Turkey - Instant message interviews
Twist - Check fewer notifications, do more meaningful work. Twist is the team communication app for calmer, more organized, and more productive teamwork.