KVirc is a Visual Internet Relay Chat Client based on the Qt library. Features include a MDI user interface, drag & drop, built-in scripting language (aliases, popups and events), customizable backgrounds and colours, DCC (chat, send with resume, voice), CTCP functions, mIRC colour support with preview, notify list, online help and configurable logging.
climm (CLI-based Multi-Messenger) is a portable, small, yet powerful console-based ICQ and XMPP client. It supports password changing, auto-away, creation of new accounts, and other features that makes it a very complete yet simple client. It is able to send and receive messages from the ICQ network, list users that are offline and online (including their online status), search for users by email address, and look up basic (name, UIN, email) information. climm was formerly known as mICQ.
GNU Gadu 2 is a modular instant messaging client with a GUI written in GTK2. It currently supports Gadu-Gadu, Tlen.pl, and Jabber. It is able to load Perl scripts, dock in several window managers, play sounds, talk to other programs via a UNIX socket, send SMS messages to Polish GSM operators, automatically check for updates, and use XOSD for displaying notices.
GYach Enhanced is a feature-rich, improved version of the original Gyach. It is the first Yahoo! client for Linux with voice chat capabilities. It offers almost all of the features you would expect to find in the official Windows Yahoo! client. The program offers support for chat, conferences, buddy lists, and My Yahoo content. In addition, Gyach Enhanced offers many features not available in the official Yahoo! clients for Windows, Mac, and Linux. Webcam support is under development and planned for the future. Unlike the original Gyach, GYach Enhanced is designed for Linux only.
The Eggdrop Jabber Bot bridges your Eggdrop IRC bot to the Jabber instant messaging network and thus to ICQ. This code is meant to be a demo that it can be done, and a basic starting point which you can extend to your needs. The only functionality currently included is an invite feature.