Acidblood
- An IRC robot for Linux. Latest release is 1.2.19, 2008-08-27.
ChatZilla!
- A cross-platform, clean, easy-to-use, and extensible Internet Relay Chat (IRC) client, built on the Mozilla platform. This is messaging client that combines Internet Relay Chat (IRC) with existing web standards like JavaScript, HTML, and CSS. It is also available in Catalan, French, German, Italian, Polish, Portuguese, Russian and Spanish. Latest release is 0.9.84, 2008-11-16.
Empathy
- A messaging program which supports text, voice, video chat, and file transfers over many different protocols. It is the default chat client in current versions of GNOME. Latest stable release is 2.32.0.1, 2010-10-04.
EnergyMech
- A Linux/UNIX compatible IRC bot; also a helpful resource site for EnergyMech (if you ignore a rather juvenile polling item on the first page).
Freenode
- This site provides discussion facilities for the free and open source software communities, for not-for-profit organizations and for related communities and organizations; a service of Peer-Directed Projects Center (PDPC).
Internet Relay Chat (IRC) Help
- An IRC help site; includes FAQs, primers, guides, downloadable clients & scripts, and server lists.
IrcII Project
- An IRC and ICB client that runs under Linux and UNIX platforms; support for utf8 languages.
Irssi
- A terminal-based IRC client for Linux and UNIX systems. Latest stable release is 0.8.15, 2010-04-03.
KMess
- A chat client for the MSN Messenger protocol -- for KDE 3.x.
KVirc - The K-Visual-IRC Client
- A cross-platform, portable Internet Relay Chat client based on the Qt GUI toolkit. Also available in French, German, Italian, and Spanish. Latest stable release is 3.4.2, 2008-10-14.
Konversation
- A user friendly IRC Client for KDE 3.x.
Twisted
- An event-driven networking engine written in Python, and supports numerous protocols. It contains a web server, numerous chat clients, chat servers, and mail servers. Latest stable release is 9.0.0, 2009-11-24.