- An IRC robot for Linux. Latest release is 1.2.19, 2008-08-27.
- 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 18.104.22.168, 2010-10-04.
- 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).
- 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).
- An IRC and ICB client that runs under Linux and UNIX platforms; support for utf8 languages.
- A terminal-based IRC client for Linux and UNIX systems. Latest stable release is 0.8.15, 2010-04-03.
- 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.
- 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.