IRC Channel: #Debian on OPN
Debian includes too many IRC tools to list. You can find them at the following places:
Debian stable.
Debian unstable (didn't receive enough testing).
Also be sure to check the proposed updates. It may have IRC clients as well.
Debian non-free (applications with a restrictive license) contains cIRCus.
IRC Channel: #RedHat on OPN (not official)
RedHat 7.1 includes the following clients:
KSirc from KDE Network 2.1.1.
RedHat Powertools (what's worth but they don't want to include or can't) 7.1 includes the following clients:
RedHat RawHide (current development)
ftp://rawhide.redhat.com/pub/redhat/linux/rawhide/. Use at your own risk.
IRC Channel: #Slackware on OPN
Slackware 8.0 includes the following clients:
KSirc from KDE Network 2.1.1.
Slackware -current (current development)
ftp://ftp.slackware.com/pub/slackware/slackware-current/. Use at your own risk.