Pidgin

Pidgin was named before Gaim and it is a instant messaging client for Windows, Linux, BSD, MacOS X. It is compatible with AIM and ICQ , MSN Messenger, Yahoo!, IRC, etc and is a multi protocol software. Pidgin supports many features of the various networks, such as file transfer, away messages, typing notification, and MSN window closing notification. The main advantage is beause you can login in more accounts in the same time and use them ,Can talk with people in AIM an Yahoo Messenger in the same time .It also goes beyond that and provides a lot of interesting features. Can notify you or alert when you have received a message, send a message, play a sound, or run a program when a specific buddy goes away, signs online, or returns from idle.It is working like other populars instant messengers.

Is an multi-instant messenger software to allow you to use all messengers accounts (Yahoo,MSN ,Google Talk,ICQ etc.) in a single application:Pidgin.
You have all the options from a classic IM and have settings for interface,conversations ,smiley themes,sounds, network,logging, status .
Pidgin, can show Buddy icons ,play animated icons ,enable sound for different actions while are typing; set proxy server and auto detect the IP address for internet connection .Can change the status when Idle.Have plugins incorporated.