AMSN

aMSN
aMSN is a tcl/tk MSN client. It works on any platform that runs wish, which includes Linux, Windows and Mac.

It supports almost anything msn can do, it also comes with multiple skins, and many more and downloadable. It has all the bells and whistles one expects from a client, along with many more due to its new plugin architecture. Numerous plugins exist, and more are coming.

The official aMSN website