PUBLIC MARKS with tags opensource & msn

BitlBee brings IM (instant messaging) to IRC clients. It's a great solution for people who have an IRC client running all the time and don't want to run an additional MSN/AIM/whatever client. If you don't want to (or can't) install BitlBee on your own machine you can also use one of the public servers. If you use Windows, this is the preferred option, as the Win32 port isn't very reliable yet.

aMSN is a free open source MSN Messenger clone, with features such as: Offline Messaging, Voice Clips, Display pictures, Custom emoticons...

Multi-protocol Proteus is an Instant Messenger that uses the IM framework libpurple and is written using Mac OS X's API Cocoa. Proteus attempts to bridge the gap between functionality and beauty, using native the Mac interface with a powerful core to get your hard core instant messaging done.

Blobsy is an Open Source MSN Messenger bot, designed for easy setup, flexibility and ease of use. It is highly customizable and adding more functionality is extremely easy. It is freely distributable under the GNU General Public License (GPL).

GAIM - Multi-Protocol Instant Messenger

Un messager instantané multi plateforme libre