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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
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, 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.
Pidgin supports many features of the various networks, such as file transfer, away messages, and typing notification. It also goes beyond that and provides many unique features.
[Previously known as "Gaim".] [Less]
Unified OS X instant messaging platform
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
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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 protocol. The core Kopete development team provides a handful of plugins that most users can use, in addition to templates for new developers to base a plugin on. [Less]
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
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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. [Less]
Miranda is the next generation Miranda IM client for Windows.
Plugin based multi-IM communicator. ncurses or gtk2 (in progress) based GUI.
Support for different protocols: irc, jabber (including gmail), gg (gadu-gadu largest polish IM), tlen, nntp (read only).
Tkabber is a client for the Jabber instant messaging system. It's writen in Tcl/Tk, and works on many platforms (tested on Linux, FreeBSD, NetBSD, Solaris, MacOS X and Windows 98/2000/XP).
Coccinella is a free and open-source cross-platform communication tool with a built-in whiteboard for improved collaboration with other people.
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
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
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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. [Less]
Ayttm is an open source, multi-protocol instant messenger. It is built using C and Gtk-2 and works across multiple platforms.
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.
IMPULS (Instant Messenger Personal User Log Storage) is a toolset which allows to retrieve, store and display messages from different IM instances in a central database.
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.
JMeeting is a next generation type of business or personal meeting. JMeeting will have audio, video and chat conferencing easily set up and viewable. JMeeting will be able to share and create presentations. During the meeting you can click present
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and it will present the presentation or document full screen to all users with a red laser to show important points. [Less]
modification of Bombus, midp mobile jabber client
Banter is a next generation real time collaboration client focused on
the big three: text, voice and video. It's centered on a dynamic,
innovative and easy to use contact management system.
Pandion is an open source instant messenger. Designed to be secure, easy and fun to use. Pandion is also compliant with the open standard XMPP (aka Jabber).
MiniIM is messaging client for jabber/xmpp protocol.
Rich UI, Windows Vista integration.