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.
LimeChat - LimeChat is an IRC client for Windows, Mac OS X and iOS. Features
Revolution IRC Client - MCMrARM has 82 repositories available. Follow their code on GitHub.
QuasselDroid - Chat comfortably, everywhere. Always stay connected to IRC, never miss a notification. Access all your channels on the go.
Atomic IRC - Mobile IRC client for Android.
Quassel IRC - Quassel IRC is a modern, cross-platform, distributed IRC client based on the Qt4 framework.