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[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.

[321 users on Ohloh]
Unified OS X instant messaging platform
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 ...
[86 users on Ohloh]
Miranda is the next generation Miranda IM client for Windows.
[36 users on Ohloh]
A chat network to IRC gateway. Currently supports Jabber, MSN, OSCAR (AIM/ICQ) and Yahoo protocols.
RioCar/Empeg Hijack
[0 users on Ohloh]
This project consists of pre-built kernels and patches which provide significant enhancements to the Linux kernel used on RioCar / EmpegCar music players.
[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.
[9 users on Ohloh]
CenterIM is a fork of CenterICQ, an ncurses-based IM client. It supports ICQ, MSN, AIM, Yahoo, Gadu-Gadu, Live Journal, IRC, RSS and Jabber protocols
[4 users on Ohloh]
Tags: cli icq chat messenger jabber
climm is a very portable text-mode instant messenger – it is known to compile under Linux, BSD, AIX, HPUX, Windows, AmigaOS and with restrictions BeOS.

climm was named mICQ in the past and started as ICQ-clone. It's intended to be a multi-messenger which supports other networks like Jabber/XMPP as well.

[3 users on Ohloh]
Ayttm is an open source, multi-protocol instant messenger. It is built using C and Gtk-2 and works across multiple platforms.
[3 users on Ohloh]
Java Instant Message (IM) Library, Client and Tools.

Flexible framework to design your own IM client or bots. Supports AIM, ICQ, Yahoo, MSN, Jabber, SMS.

Fully functional GUI with spell checking and a lot more. Includes a web interface for remote/cell access.

[3 users on Ohloh]
joscar is an easy-to-use, robust library for connecting to AOL Instant Messenger from Java.

With joscar, your users can send and receive messages (including image & secure messages), transfer files, and join chat rooms. A powerful event model allows for tight integration with a graphical or Ajax interface, to provide a cool user experience.

[0 users on Ohloh]
Coptic IM is a text-based (ncurses) instant messenger written in C.
It aims for full UTF-8 support and portability.
[0 users on Ohloh]
Funpidgin is a fork of the popular open source client Pidgin which allows instant messaging with over twenty different protocols.
[0 users on Ohloh]
Tags: chat icq
There are many people, who search server that support several protos and can work as corporate internet connection-independent ICQ gate.
[0 users on Ohloh]
This Google Code project is currently closed (and probably permamently), please go to:


...For latest MIM build and plugins!

[0 users on Ohloh]
Tags: console chat cmc lily icq irc aim
naim includes unique features like zero-configuration peer to peer encryption, automatic message queueing, and incoming message modification (to correct common spelling mistakes and expand common abbreviations; see /help filter). naim also includes powerful dynamic module support, allowing developers to modify all major aspects of naim's behavior. Third-party plug-ins have been used to extend naim's functionality for use in embedded monitoring clients, and for use as host to automatic clients ('...
[0 users on Ohloh]
A set of PHP and JavaScript classes implementing the client application for instant messaging via the protocol ICQ (OSCAR).

At this stage, the client will only work correctly in FireFox browser!

The package is in development, so there may be many defects (bugs =))

Getting Started (RUS) How it works (RUS) ContactsICQ: 839849[zero][six] http://silly.servehttp.com Based on: WebIcqProauthor Sergey Akudovich version 1.4.6b package WebIcqPro disscus this package here. ScreenshotsC...

[0 users on Ohloh]
Tags: icq skype msn talk chat
Zdbrig talk is a open source library that helps to create desktop application , working on the internet.

Zdbrig Talk uses XMPP protocol and other famous chat server (like MSN and Skype) to realize an easy connection between users.

[0 users on Ohloh]
This is what you think about for a long time — smart, easy and attractive tool to do things you are so used to do. All your old contacts and features in a new professional and stylish solution.

I think that we together could do the greatest IM product the world ever seen :)