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GNU Gadu is program "Instant Messenger" created to work with polish protocol (but not only). It works with plugins, interface written in GTK+ as plugin. In program are avaible protocols: Gadu-Gadu, Tlen.pl and Jabber.

ICQ client for X11/Qt/KDE (also available for Windows and Mac)

Kopete is a flexible and extendable multiple protocol instant messaging system designed as a plugin-based system. All protocols are plugins and allow modular installation, configuration, and usage without the main application knowing anything about the pl

Akeni LAN messenger is a cross-platform instant messenger client. It is a P2P program that works on your LAN without the need of an Internet connection or a dedicated server.

Everybuddy is designed to become a Universal Instant Messaging client which will seamlessly integrate all existing IM clients and provide a single consistent user interface. Currently, Everybuddy supports sending and receiving messages in AIM, ICQ, Yahoo!

MSN Messanger for KDE.

mICQ (Matt's ICQ Clone) is a portable, small, yet powerful console-based ICQ client. It supports password changing, auto-away, creation of new accounts, and other features that makes it a very complete yet simple client.

Gorgious IRC client.

MSNre is a lightweight but powerful console-based MSN Instant Messenger clone.

Yet another text mode IRC client.

Tkabber is one of many clients for open communication service Jabber. Tkabber uses only a Jabber protokol and therefore offers almost complete implementation of this protocol, far more complete than other Jabber clients

Kadu project was started in 2001 as a simple KDE API try-out. Eventually, it became the most popular Gadu-Gadu client for Linux and other Unices or MacOSX.

Console instant messenger. Supports ICQ, Yahoo, AIM, Jabber with SSL, RSS-news feeds. Works both with server-side or local contact list, import it from other clients, saves messages and events into history.

IRC client. Support for all comunication functions and plugins written in some from scripting languages. The most interesting is plugins for remote control of Xmms.

Psi is the premiere Instant Messaging application designed for Microsoft Windows, Apple Mac OS X and GNU/Linux. Built upon an open protocol named Jabber, Psi is a fast and lightweight messaging client that utilises the best in open source technologies.

openWEBchat is an communication tool.

Modular ICQ client. Offers many plugins, you may choose from many GUIs (GTK, Qt, console). Supports all standard functions like contact list (synchronized with ICQ server), file transfers, chat mode, tabbed windows, user search, history, skins.

TleenX is a Tlen.pl instant messaging system client, which works in X-Window environment using GTK+ library to build interface. The common library for TleenX is libtlen, which we have to install before compiling TleenX.

Linphone allows you to make two-party phone calls using an IP network. Easy to use, it has a gnome graphical interface.

KDE based ICQ client.