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Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community
irssi - Irssi is a terminal based IRC client for UNIX systems.
LiveAgent - LiveAgent is a fully-featured web-based live chat and help desk software. It harnesses the power of a universal inbox, real-time live chat, built-in call center, and a robust customer service portal. Start your free 1 month trial today!
mIRC - mIRC: Internet Relay Chat client
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.