Pidgin 2.6.3

Pidgin (formerly named Gaim) is a multi-platform instant messaging client, based on a library named libpurple. Libpurple has support for many commonly used instant messaging protocols, allowing the user to log into various different services from one application.The number of Pidgin users was estimated to be over 3 million in 2007. Both Pidgin and libpurple are free software, released under the terms of the GNU General Public License.
Pidgin is a graphical front-end for libpurple using GTK+. Libpurple is notable for its support for multiple instant messaging protocols.
Pidgin supports multiple operating systems, including Windows as well as many Unix-like systems such as Linux, BSD, Mac OS X, and AmigaOS (through the X11 engine).
HOMEPAGE: www.pidgin.im
 DOWNLOAD: pidgin-2.6.3
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It has built-in support for NSS, offering client-to-server message encryption for protocols that support it. The program is extendable through plugins, including "Off-the-Record Messaging" and Pidgin encryption, providing end-to-end message encryption.
Pidgin features some of the standard tools for an instant messaging client, such as a contact list, file transfer on supported protocols, and conversation and chat logging. Tabbed conversations is an optional feature on Pidgin. The IM window consists of the message window, formatting tools, and an edit box.
Contacts (usually known as "Buddies") are added by the "Buddy List" window or by the IM window. As a client that supports IRC and other chat programs, it can also add different IRC channels and IM Chats. Contacts with multiple protocols can be grouped into one single contact instead of managing multiple protocols and contacts can be given aliases as well or placed into groups.
To reach users as they log on or a status change occurs (such as moving from "Away" to "Available"), Pidgin supports on-action automated scripts called Buddy Pounces to automatically reach the user in customizable ways.
Pidgin supports some file transfers, with the ability to pause, resume, and cancel transfers and observe multiple transfers in a separate window, lacking more advanced features like folder sharing from Yahoo. However, when used through the MSN protocol, file transfers are slow, as data is routed through MSN servers to the receiver, instead of utilizing a faster peer-to-peer functionality[4]. A Google Summer of Code project aimed to add peer-to-peer functionality in 2007[5]. Support for MSNP15 was added in version 2.5.0 but did not include support for peer-to-peer transfers.
As of version 2.6 (released on August 18, 2009) Pidgin has a voice/video framework which uses Farsight2 and is based on Mike Ruprecht's Google Summer of Code project from 2008. That release provides the ability to have voice/video conversations using the XMPP protocol (including Google Talk), though the implementation is not yet fully complete. The framework will also allow for voice/video conversations on other protocols, such as MSN and Yahoo, in the future.
Further features include support for themes, emoticons, spell checking, and notification area integration.

Supported protocols:

The following protocols are officially supported by libpurple 2.5.5, without any extensions or plugins:

+Bonjour (Apple's implementation of Zeroconf)

+Gadu-Gadu

+Internet Relay Chat

+Lotus Sametime

+MySpaceIM

+.NET Messenger Service (commonly known as MSN Messenger or Windows Live Messenger) (no  multimedia support)

+Novell GroupWise

+OSCAR (AIM/ICQ/.Mac)

+QQ

+SIMPLE

+SILC

+XMPP (Google Talk, LJ Talk, Gizmo5, ...)

+Yahoo (only basic chat and file transfers)

+Zephyr

Pidgin 2.6.3 Bugs fix's:

+AIM and ICQ:
* Fix a crash when some clients send contacts in a format we don't understand.
* Fix blocking and other privacy lists. (Thanks to AOL)

+General:
* Fix a crash when performing DNS queries on Unixes that use the blocking DNS lookups.