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.
A smaller, faster, and easier IM client
Miranda IM is an open source, multi-protocol instant messaging client designed to be very light on system resources, extremely fast and customizable. A powerful plugin-based architecture make Miranda IM one of the most flexible clients on the planet.
Encryption plugin for Pidgin, providing up to 4096 bit RSA encryption using the NSS crypto library from Mozilla. Keys are automatically transmitted and stored, making it very easy to use, but also resistant to man-in-the-middle attacks.
Bot Sentry is a Pidgin (libpurple) plugin to prevent Instant Message (IM) spam. It allows you to ignore IMs unless the sender is in your Buddy List, the sender is in your Allow List, or the sender correctly answers a question you have predefined.
Licq is an ICQ/AIM clone written fully in C++. It uses an extensive plugin system to manage many different functions including the MSN protocol. The main GUI is written using the Qt widget set.
pork, oidentd, iplog and ocd
A graphical notification plugin for the instant message client gaim. Now hosted at http://plugins.guifications.org/trac
Fire is a multi-protocol instant messenger client for Mac OS X based on freely available libraries for each service. Currently Fire handles AOL Instant Messenger®, ICQ®, MSN® Messenger, Jabber, limited IRC, Yahoo!®, and Apple Bonjour communications.
A free Win32 instant messaging client. Smaller, Faster, Easier.
A pidgin plugin that allows user to assign global hotkeys (e.g. Ctrl+Alt+g) for togglling buddy list and reading queued message. When "Toggle List" hotkey is enabled, it makes the buddy list hidden from your taskbar and task switcher (similar to ICQ).
Intercepts and parses all instant message traffic received by the computer. A high performance engine allows conversations to be viewed immediately and/or saved for later analysis. NOTE: Requires WINPCAP
JAIMBot is a modular architecture for providing services through an AIM client. It contains a generic AIM library and a Bot which uses this library to provide such services as Offline Messaging, Lists, Weather, Headlines, Stock Quotes, AI chatterbot.
Gabber is an easy yet powerful Jabber client for GNOME. Jabber is a powerful open source instant messaging system. Jabber allows communication with other networks, such as ICQ, AIM, MSN, Yahoo, and even IRC, but beyond that it has unique features of its
Kopete is a flexible and extendable multiple protocol instant messaging system designed as a plugin-based system.
Pidgin Extended Preferences provides additional preferences for Pidgin users. Most notably, it allows you to change the font size of conversation text without changing your theme and to change how quickly or whether the buddy list tooltips appear.
Line-based AIM client and BSD-licensed OSCAR library.
Multiprotocol plugin-based instant messenger for X11 (optionaly support KDE), Windows and MaxOS X.
Quotes Database System (formerly Salty Quotes Database, named so because it was made for the development site saltine.net) is a small script written by Kyle Florence a few years ago that will store IRC quotes, it's like your own personal bash.org.
This project has re-identified it's purpose to being a host of 'starter' projects for GUI-based Jabber code. To be included, Visual Basic, Visual C++, Borland C++ Builder, etc.
Driver support for 3D Controller Hardware. We hope to support SDL Input, DirectInput, and other major controller API's including game consoles and embedded systems.
Audible Alerts is a Pidgin (libpurple) plugin to produce notification of an IM audibly. It uses eSpeak, a text-to-speech program, to call out the name of the buddy who IMs you. You can download eSpeak from www.sourceforge.net/projects/espeak
Jarl is a Perl/Tk Client. It strives to provide full functionality with every aspect of the Jabber IM system. It currently supoprts messaging, chat, groupchat, ICQ, AIM, and IRC support.
Ayttm is an instant messenger program, supporting various protocols such as MSN, Yahoo, AIM, Jabber, and more. It is the heir of the Everybuddy project, and aims to continue improving the program and addressing its shortcomings.
Current Track plugin will update your Gaim/Pidgin user info, available message or away message, and buddy icon from iTunes, Winamp, RealPlayer, WMP, Musicmatch, MediaMonkey, XMPlay, Yahoo! & Foobar2000 in Windows and XMMS, Rhythmbox, & Amarok in Linux.
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.