Pidgin is a popular open-source instant messaging client. Pidgin 2.0 includes the following features:
Many improvements to the UI modules including status system, Buddy List, Conversation, and the chat window
New Yahoo features including Stealth Settings, Doodle, and the /list command
Improved AIM and ICQ file transfers
Improved Log Viewer module
Support for the new version of ICQ file transfer
New IRC features including SSL support, and the new commands /whowas, /nickserv, /memoserv, /chanserv, and /operserv
Jabber features including support for SRV lookups, buddy icons, and Jabber User Directory searching