What are some alternatives?
When comparing AdiIRC and Pidgin, you can also consider the following products
irssi - Irssi is a terminal based IRC client for UNIX systems.
Trillian - Trillian is a decentralized and federated instant messaging platform that lets your whole company send private and group messages, keep tabs on what co-workers are doing, share files, and much more.
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.