Clients

mIRC

mIRC is the most popular IRC Client for Windows.

License: Proprietary/Nagware
Website: www.mirc.com


XChat

XChat is an IRC Client for Windows, Linux/Unix and macOS.

License: Proprietary for Windows version, GNU General Public License for others
Website: www.xchat.org


Irssi

Irssi is a text mode IRC Client for Windows, Linux/Unix and macOS.

License: GPL
Website: www.irssi.org