tawk.to - tawk.to is a free live chat app that lets you monitor and chat with visitors on your website or from a free customizable page
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.
LiveChat - LiveChat - premium live chat software. Approach customers directly on the website, make connections and drive more sales using LiveChat.
mIRC - mIRC: Internet Relay Chat client