A universal instant messaging (IM) program
See https://pidgin.im/about/ for more information. Pidgin is an instant messaging program which lets you log in to accounts on multiple chat networks simultaneously. It runs on Windows, Linux, and other UNIX operating systems. Pidgin is compatible with the following chat networks out of the box: AIM, ICQ, Google Talk, Jabber/XMPP, MSN Messenger, Yahoo!, Bonjour, Gadu-Gadu, IRC, MXit, Novell GroupWise Messenger, Lotus Sametime, SILC, SIMPLE, MySpaceIM, and Zephyr. It is written in C and makes heavy use of GLib and GTK+. Finch is a command line instant messaging program. It also lets you log in to accounts on multiple chat network simultaneously, and it is compatible with the same chat networks as Pidgin. It is written in C and makes heavy use of GLib and ncurses.
Psi IM — Qt-based XMPP/Jabber client
Psi aims to be a feature-rich Jabber/XMPP client for novice and experienced Jabber users. There are builds available for MS Windows, GNU/Linux and macOS.
A fork of pidgin which aims to provide minor features that have not been addressed by the pidgin development team (including manual textbox resizing). See funpidgin.sf.net for details.
XMPP PHP BOT (XPbot) - simple, extensible jabber bot
XPBot or rather Xmpp Php Bot is an extensible, modular and modern XMPP(Jabber) bot written entirely in PHP. XPBot utilizes all major PHP 5.4 and in feature we're gonna probably move our code base to 5.5 version to provide even better user (and developer!) experience. This bot is going to be 100% modular, so you can replace almost every part of the bot. It's of course free to use (even commercial!). Want to know more? Look at our homepage (Work in progress).
climm is a portable, small, yet powerful console based, fully internationalized instant messaging client supporting the current v8 ICQ protocol and XMPP.
ExtremeTalk(XT)是一个用于企业或者组织内部进行在线通讯的，基于XMPP(Jabber)协议的即时通讯系统。ExtremeTalk(XT) is an Instant Messaging(IM) collaboration platform based on XMPP(Jabber) for enterprises and organizations
PHP Jabber Bot open source. Minimal requirements: PHP > 5[CURL, ICONV, SOCKETS opened 5222 port], MySQL Included many plugins: google, horo, news, translate and more...
Create and setup in couple lines of code, simple GG bot.
ChatCaptain aims to be an alternative to the chat clients not only available on Linux, but also an alternative to the non-free(and free alike) chat clients available on Windows.
JGGAPi is java implementation of Gadu-Gadu protocol. Gadu-Gadu is a IM system very popular in Poland based on proprietary protocol. The implementation is based on specification of Gadu-Gadu protocol gathered during implementation of EKG application.
Yet another jabber server written in PHP, supporting TLS, XMPP compliant.
Remote control your linux console encrypted trough Jabber chat service
With PigTerm you can chat with your Linux terminal. PigTerm connects you to your/your friends/your office Linux computer's terminal trough Jabber messaging (XMPP Protocol services like Gtalk). So that you do not need ssh access to do this. Think of pigterm as a Remote Assistant for Linux Console. This is useful specially when your remote computer do not have a valid IP address. The software uses QXMPP opensource library (http://code.google.com/p/qxmpp/). The complete code of this library is imported into source tree so that you do not need to compile and install that first. All communication is encrypted using QCA Library. The software does not involve with export control regulations as in QCA (http://delta.affinix.co/docs/qca/) Site they wrote: Functionality is supplied via plugins. ... . Also, by pushing crypto functionality into plugins, your application is free of legal issues, such as export regulations.
Egalite supports direct 1-1 chat with SSL over IPv4 or IPv6, as well as server based chat with IRC or XMPP (Jabber).
Froggie is an easy yet powerful Jabber multiplatform client. Jabber is a powerful open source instant messaging system.
Google Chat Client
The old google chat client (gTalk) had a nasty UI and looked old and needed a facelift and some additional plugins like Google Hangout support and Email in client itself.
imEcourse is a course electing system for college students.It bases on IM.Including executable application IM and web-IM. To use IM to elect course?Of course!