Mumble - Mumble is an open source, low-latency, high quality voice chat software primarily intended for use...
RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
Mohawk Voice - Mohawk Voice is a low resource, high quality VoIP program which is free to download and use.
Dialpad - Switch is a cloud-based phone system built for Google Apps users.
Steam Chat - Steam Chat is a chatting app for Steam users that enables them to chat through their cell phones and get updated with what is happening.
Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs