IRCCloud is described as 'IRC client with a future. Stay connected, chat from anywhere, and never miss a message' and is an app in the Social & Communications category. There are more than 50 alternatives to IRCCloud for a variety of platforms, including Windows, Linux, Online / Web-based, Mac and Self-Hosted solutions. The best alternative is HexChat, which is both free and Open Source. Other great apps like IRCCloud are Ripcord (Free Personal), mIRC (Paid), Quassel IRC (Free, Open Source) and XChat for Linux (Free, Open Source).
IceChat is a fully featured, simple to use IRC Client allowing you to chat online with your friends and for meeting new people as well. It can be used in Windows 95/98/ME/2000/XP/2003/Vista and also Windows 7
mIRGGI is the first IRC client for S60 3rd Edition devices. It is also available for 2nd edition devices. It is currently in early stages because I just began writing it on 10th of March. Ive been meaning to do this for a long time but havent gotten to it.
wsIrc - the global community communicator, goal is to offer a free web IRC client which should be at the end as good as old standalone application, but yet without requiring any installation, without any update, without any virus risk, and maybe we will offer yet a few...
The sushi IRC suite consists of a central daemon and several clients, which communicate via DBus. The daemon -- maki -- provides DBus methods and signals that abstract the IRC protocol to make it more pleasant to use.