LAN Messenger - LAN Messenger is a decentralized UDP IM-style chat client which supports usernames...
RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
Softros LAN messenger - LAN messenger for an internal office chat for home or business users. It does not require a server and is very easy to install and use. It supports personal chats, group chats, message brodcasting, files transfer and remote desktop access.
Dialpad - Switch is a cloud-based phone system built for Google Apps users.
MyChat - Secure instant messenger for any network
Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs