mIRC - mIRC: Internet Relay Chat client
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.
LimeChat - LimeChat is an IRC client for Windows, Mac OS X and iOS. Features
Bidbar - Save and run Terminal commands from the Mac menu bar
Revolution IRC Client - MCMrARM has 82 repositories available. Follow their code on GitHub.