Pidgin is a chat program which lets you log in to accounts on multiple chat networks simultaneously. This means that you can be chatting with friends on MSN, talking to a friend on Google Talk, and sitting in a Yahoo chat room all at the same time.
Pidgin 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, Novell GroupWise Messenger, QQ, Lotus Sametime, SILC, SIMPLE, MySpaceIM, and Zephyr. It can support many more with plugins.
Pidgin supports many features of these chat networks, such as file transfers, away messages, buddy icons, custom smilies, and typing notifications. Numerous plugins also extend Pidgin's functionality above and beyond the standard features.
Pidgin integrates with the system tray on Windows.
version 2.5.2 (10/19/2008):
* Fixed a crash on removing a custom buddy icon on a buddy.
* Fixed a crash caused by certain self-signed SSL certificates.
* Enable a number of strong ciphers which were previously disabled
when using NSS. (Thanks to Marcus Trautwig.)
* The status selector now saves your message when changing status.
* Fix a case where a conversation window could close unexpectedly.
* A mute sounds option has been added to the preferences window to
help with discoverability. CTRL+S is no longer bound to mute.
* Added ability to change the color of visited links (using the theme
control plugin, or setting the color in ~/.gtkrc-2.0)
* Fix a crash occuring when a custom smiley is deleted and re-added and
used in an open conversation after being re-added.
* A new 'Nested Grouping' option in the 'Grouping' plugin. Group
hierarchies are defined by the '/' character in the group names.
* A bug was fixed where some key-bindings wouldn't work with some TERMs
(e.g. xterm-color, screen-linux etc.)
* Operations (such as moving to a new group) on contacts that were added
in the same session should now complete correctly, and not cause
synchronization errors at next login.
* Minor fixes to login process during a server transfer.
* Restored the "Has You" feature to the MSN protocol tooltips.
* ADL 205/214/etc errors should no longer prevent login.
* Sending and receiving custom smileys using the specification in
XEP-0231 (bits of binary) and XHTML-IM
* Only send a Ping once every hour. This prevents the account from
being disconnected from the server periodically.