Shtuff Chat - Free Group / Team chat with persistent history.
RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
Meet in Chat - Meet new people. Have fun sharing photos.
Dialpad - Switch is a cloud-based phone system built for Google Apps users.
Kandan - Open Source private chat server. Your own private Chat server in minutes, plus additional features.
Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs