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Pidgin
[1131 users on Ohloh]
Pidgin is an instant messaging program for Windows, Linux, BSD, and other Unixes. You can talk to your friends using AIM, ICQ, Jabber/XMPP, MSN Messenger, Yahoo!, Bonjour, Gadu-Gadu, IRC, Novell GroupWise Messenger, QQ, Lotus Sametime, SILC, SIMPLE, and Zephyr.

Pidgin can log in to multiple accounts on multiple IM networks simultaneously. This means that you can be chatting with friends on AIM, talking to a friend on Yahoo Messenger, and sitting in an IRC channel all at the same time.

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irssi
[330 users on Ohloh]
The most used console irc client
X-Chat
[250 users on Ohloh]
X-Chat is a fully-featured graphical IRC client using the GTK toolkit. It can be compiled to use GNOME and Perl scripting.
Kopete IM Client (KDE)
[226 users on Ohloh]
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 plugin being loaded. The goal of Kopete is to provide users with a standard and easy to use interface between all of their instant messaging systems, but at the same time also providing developers with the ease of writing plugins to support a new ...
Psi
[99 users on Ohloh]
Psi is a leading instant messaging / real-time communications client for the Jabber network (using the XMPP protocol). It is cross platform, available for Windows, Mac OS X and X11 (Linux, BSD, Solaris etc.) platforms. It uses the Qt library.

It aims to be (and is famous for being) standards compliant and stable. It is also at the cutting edge of XMPP development, with several of the authors very actively involved in the XMPP standards extension process.

Facebook Plugin for Pidgin
[86 users on Ohloh]
A Facebook plugin for Pidgin. Lets you send and receive messages using the Facebook Chat protocol from your favourite instant messenger.
skype4pidgin
[68 users on Ohloh]
skype4pidgin is a plugin for libpurple programs such as Pidgin or Adium, to be able to use the Skype API to control and use Skype to send IM's
RioCar/Empeg Hijack
[0 users on Ohloh]
Tags:
This project consists of pre-built kernels and patches which provide significant enhancements to the Linux kernel used on RioCar / EmpegCar music players.
Empathy
[25 users on Ohloh]
Empathy consists of a rich set of reusable instant messaging widgets, and a GNOME client using those widgets. It uses Telepathy and Nokia's Mission Control, and reuses Gossip's UI. The main goal is to permit desktop integration by providing libempathy and libempathy-gtk libraries. libempathy-gtk is a set of powerful widgets that can be embeded into any GNOME application.
InspIRCd
[24 users on Ohloh]
InspIRCd is a modular C++ IRC Daemon (ircd) for Linux, BSD and Windows systems created to provide a stable, modern, lightweight irc server from scratch and provide a vast number of features in a modularised form using an advanced module API. By keeping the functionality of the main core to a minimum we hope to increase the stability and speed of our project and make it customisable to the needs of many users. InspIRCd is designed primarily to be a custom irc server for the chatspike irc network ...
aMSN
[20 users on Ohloh]
Alvaro's Messenger is a Tcl/Tk client for MSN Messenger. Its features include multi-language support, smileys, docking support for KDE 3 and GNOME 2 (FreeDesktop compatibility), logging, profiles support, email notification, customizable sounds, group management, file transfers with NAT support, and proxy support. Some special features include the possibility of knowing who has deleted you from his/her list, connecting "silently" (appearing invisible), and so on.
KVIrc
[19 users on Ohloh]
KVIrc is a free portable IRC client based on the excellent Qt GUI toolkit. KVIrc is being written by Szymon Stefanek and the KVIrc Development Team with the contribution of many IRC addicted developers around the world.
Supybot
[15 users on Ohloh]
Supybot is a cross-platform IRC bot written in Python, known to run anywhere Python runs, which includes all *nices, and Windows.

1. Supybot is actively developed.
2. Supybot offers nested commands.
3. Supybot has a powerful and flexible capability system for handling security.
4. Supybot includes many plugins , and has many more ripe for the picking on this very website.
5. Supybot supports multiple servers.

citadel
[11 users on Ohloh]
Citadel is a highly integrated Groupware Platform with a Web 2.0 enabled Web interface, but also providing SMTP, IMAP, POP3 and GroupDAV access to its content.

Citadel offers Versatile email services with very low administration needed. It provides its own implementations of these server protocols:
Imap, Pop3, SMTP, ManageSieve, Citadel.

Coccinella
[10 users on Ohloh]
Coccinella is a free and open-source cross-platform communication tool with a built-in whiteboard for improved collaboration with other people.
UnrealIRCd
[9 users on Ohloh]
Tags: internet-relay-chat chat ircd irc unix linux
ZNC
[8 users on Ohloh]
ZNC is an IRC bouncer with many advanced features like detaching, multiple users, per channel playback buffer, SSL, IPv6, transparent DCC bouncing, and c++ module support to name a few.
JabberLib
[7 users on Ohloh]
A Jabber/XMPP library written in Tcl.
galaxium
[6 users on Ohloh]
Galaxium is an instant messenger application designed for the GNOME desktop. It will allow you to connect to MSN (and other protocols through the use of addins) to communicate with your family, friends and co-workers! It is a cross-platform application that uses the Mono and GTK# toolkits for the user interface and protocol handlers. Several plugins are also in the works to bring advanced features like Adium Theme support.
Anope IRC Services
[5 users on Ohloh]
Anope is a set of IRC Services designed for flexibility and ease of use. It forked from Epona early 2003 to pick up where Epona had been abandoned.