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Coccinella Coccinella is a Jabber client with a whiteboard. The whiteboard is a shared desktop which supports text, drawings, images, and multimedia in a number of formats, such as MP3 and video. It runs in two modes: a peer-to-peer configuration and a mode compatible with the Jabber Instant Messaging system. A flexible plugin architecture support additional formats.

Ejabberd 'ejabberd' is a multi-platform, scalable, distributed, and fault-tolerant XMPP Jabber server. It supports advanced features such as multi-user chat, IRC transport, publish and subscribe services, Jabber user directory, a Web-based administration interface, an HTTP polling service, SSL and TLS support, LDAP and external authentication.

Empathy Empathy is a messaging program which supports text, voice, and video chat and file transfers over many different protocols. You can tell it about your accounts on all those services and do all your chatting within one application. Empathy uses Telepathy for protocol support and has a user interface based on Gossip. Empathy is the default chat client in current versions of GNOME, making it easier for other GNOME applications to integrate collaboration functionality using Telepathy.

Eva 'Eva' is an IM client in KDE that uses QQ IMprotocol to communicate with other clients Gaim with OpenQ plugin or LumaQQ written in Java.

Festival Gaim Gaim plugin which enable you hear your incoming messages using voice synthesis.

GNU Messenger GNU Messenger is a messaging system that attempts to keep your conversations private from everyone except the intended recipient. It is compatible with existing IM networks and lets you to communicate with other GM users even when you're not using a native server. Features include autoconf support, interoperability with other popular IM networks, separate frontend and backend (which makes it easy to write new clients, a buddy list, and taskbar docking. This project has been decommissioned and is no longer developed.

Gaim-e 'gaim-e' is an encryption plugin for gaim. It uses GNUPG (GPG) to securely transfer the session key (RC5). It currently works with AOL, MSN, and Yahoo. Other protocols supported by gaim have not yet been tested.

Gajim Gajim is a Jabber client written in PyGTK. The goal of Gajim project is to provide a full featured and easy to use xmpp client for the GTK+ users. Gajim does not require GNOME to run, even though it exists with it nicely.

Gale Gale is a messaging system resembling Zephyr in UI and social characteristics, but IRC in architecture, with some features of its own. It supports the use of public-key cryptography for privacy and authentication. It has a spanning-tree topology with failover, little server state, no concept of "op privileges", security through end-to-end encryption, multi-line messages, and command-line-driven clients, and directed categories, which prevents unnecessary distribution of messages.

Gicq 'gicq' is an ICQ-compatible instant messaging client for Unix systems. It is based on the GTK toolkit. At the present time, the feature list is rather short. However, the most important stuff works - you can log on with an existing ICQ account, search for other users and add them to your contact list, and send and receive messages. 'gicq' uses libicq, which does most of the work.

Gnome ICU GnomeICU (formerly GtkICQ) is an Internet Communication Utility for Gnome. It is based on the ICQ protocol, and may be used to communicate with any other GnomeICU or ICQ users, either in GNU/Linux or whatever other OS your friends feel like using.

Gnome IP Messenger Gnome IP Messenger (GIPMSG) is WinPopup-like communication tool that works over TCP/IP. GIPMSG is a complete GNOME/GTK+ program, with full GNOME applet support. Using GIPMSG is easier than e-mail and requires little setup.

Gnu Gadu 2 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.

Gtmess gtmess is a console MSN Messenger client for GNU/Linux and other systems that conform to the POSIX standard. It supports the MSNP9 protocol version. Apart from the basic stuff like file transfers and chat windows, it offers some advanced features like message logging, contact list cleanup, spoofing the typing user (on some clients), and a popup notifier (via Tcl/Tk). It is UTF-8 compliant.

Gyach Enhanced GYach Enhanced is a feature-rich, improved version of the original Gyach. It is a Yahoo! client for GNU/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! client. Unlike the original Gyach, GYach Enhanced is designed for GNU/Linux only.

Ignorance Ignorance is a flexible, powerful content filtering plugin for Gaim.

Kaim Kaim is an AOL Instant messenger client using the QT public library. Due to legal problems, this package has been renamed 'kinkatta.' Please see that entry for the most recent version of the software.

Kinkatta Kinkatta is an AOL instant messenger for KDE. Kinkatta contains all common instant messenger features such as logging, aliases, chat rooms, proxys, auto-away, pounce, last on, idle, per-buddy audio configuration, and complete chat window configuration. It was formerly known as 'kaim.'

Kopete Kopete is a 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 plugin being loaded. Kopete's goal is to provide users with a standard, simple interface between all of their instant messaging systems, while also giving developers an easy wasy to write plugins to support a new protocol. The core Kopete development team provides a handful of plugins that most users can use and templates for new developers to base a plugin on.

Laffer Laffer is a Web-based instant messenger client. It supports ICQ, MSN, AOL, Yahoo, Jabber, and other messenger networks. Laffer is written in HTML and JavaScript, and it uses DOM 1.2 and PHP. Laffer is capable of exchanging text messages, contact list visualization, presence status visualization, and getting information about the user. No file, audio, or video exchange is supported at the moment.