SendBird - SendBird is messaging-as-a-service.

HexChat - HexChat is a fork of XChat with bug fixes and new features.

Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.

irssi - Irssi is a terminal based IRC client for UNIX systems.

Live800 - Live800 is an enterprise-grade Live Chat and Customer Service platform that enables businesses to provide instant support to their customers through a variety of channels, including Live Chat, Email, Phone, and Social Media.

mIRC - mIRC: Internet Relay Chat client