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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.