Quassel IRC is a modern, cross-platform, distributed Internet Relay Chat (IRC) client based on the Qt4 framework. Read more hot
KMyIRC is the try to bring a good and easy, not full bloated, IRC client to KDE. Of course, there are several other IRC client like ksirc or kvirc, but they're - not userfriendly - full bloated with too much of stuff the normal irc user doesn't need.
Konversation is a simple and easy to use IRC client for KDE3 with support for strikeout, multi-channel joins, away/unaway messages, ignore list functionality, experimental support for foreign language characters, auto-connect to server, optional timestamps in chat windows, configurable background colors. Read more
Kvirc is a free portable Internet Relay Chat client based on the excellent Qt GUI toolkit. Read more
QIrc is a chat client coded using the QT libraries ver. 1.45. It´s a very recent program, but it has all the basic features you could find in any other chat client. It has DCC Send and Receive, CTCP, Notify, Ctcp Flood protection, mIrc colors both in the chat windows and in the channel list, and everything in a nice colorful interface.
SaNVirC is a script for KVirc that includes functions like nick identification, autojoin, defense, attack, bots management, an away system, etc.
xIrc is an easy to use X11 Irc client written in C++ using the QT GUI class library.