Gaim - (Open Source)
Chatting with friends on AOL Instant Messenger, talking to a friend on Yahoo Messenger and stay on an IRC channel at the same time is possible when using Pidgin software.
Pidgin is an email client that allows to chat with MSN, Google Talk, AIM, ICQ and other contacts, from a single interface. Available in several languages, this software offers convenient features to comfortably talk.
Pidgin software brings together in a single window the AIM, ICQ, Google Talk, Jabber / XMPP, MSN Messenger, Yahoo!, Bonjour, Gadu- Gadu, IRC, Lotus Sametime, SILC, SIMPLE, MXit, MySpaceIM and Zephyr contacts.
The application gives the ability to chat with multiple contacts at once even if they come from different networks discussion. It is even possible to make a conference if necessary.
Even if the icons of contacts for each account are already marked by their respective icons, it does not prevent the user to create customized friends, relatives, colleagues categories, etc.
Pidgin offers several smileys to liven up the discussion. As the software supports adding plugins, user can also download more smileys on the Internet to enrich the library.
* ICQ
o Fix misparsing a web message as an SMS message. (Yuriy Kaminskiy)
* MSN
o Increase NS command history size to prevent crashes on buddy lists that have a lot of buddies on other networks like Yahoo!
* MySpace
o Accounts with empty buddy lists are now properly marked as connected.
o Fix receiving messages from users of MySpace IM's web client.
* Yahoo
o Fixed phantom online buddies. They should now properly disappear when signing out.
o Fixed the crashes some users were seeing with cn.scs.msg.yahoo.com in 2.5.7.
o Fixed compiling on systems with glib 2.4.x or older.
o Fixed an issue with file transfers. This may not resolve all issues, but it should resolve at least some of the most common ones.
o The pager server will automatically update to scsa.msg.yahoo.com if the user empties the field or if it is scs.msg.yahoo.com. This should ease the pain of transition to the new login method.
* XMPP
o Fix an incompatibility betweeen Prosody and libpurple clients.