What are some alternatives?
When comparing Textual and Trillian, you can also consider the following products
irssi - Irssi is a terminal based IRC client for UNIX systems.
Pidgin - Pidgin is an easy to use and free chat client used by millions. Connect to AIM, MSN, Yahoo, and more chat networks all at once.
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.
mIRC - mIRC: Internet Relay Chat client
Jitsi - Open-source video calling and chat platform.