HexChat - HexChat is a fork of XChat with bug fixes and new features.
Skype - Stay in touch with your family and friends for free on Skype. Download Skype today to chat and call on desktop and mobile.
irssi - Irssi is a terminal based IRC client for UNIX systems.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Adium - Adium is a free instant messaging application for Mac OS X that can connect to AIM, MSN, Jabber, Yahoo, and more.
Facebook Messenger - Facebook Messenger is a faster way to message.