A universal instant messaging (IM) program
See https://pidgin.im/about/ for more information. Pidgin is an instant messaging program which lets you log in to accounts on multiple chat networks simultaneously. It runs on Windows, Linux, and other UNIX operating systems. Pidgin is compatible with the following chat networks out of the box: AIM, ICQ, Google Talk, Jabber/XMPP, MSN Messenger, Yahoo!, Bonjour, Gadu-Gadu, IRC, MXit, Novell GroupWise Messenger, Lotus Sametime, SILC, SIMPLE, MySpaceIM, and Zephyr. It is written in C and makes heavy use of GLib and GTK+. Finch is a command line instant messaging program. It also lets you log in to accounts on multiple chat network simultaneously, and it is compatible with the same chat networks as Pidgin. It is written in C and makes heavy use of GLib and ncurses.
emesene is a platform independent instant messaging client for the Windows Live Messenger (tm) network. emesene is distributed free of charge under the GNU General Public License 2 or any later version.
Gimel is a Python-based multiple protocol instant messaging application developed with flexibility in mind. Gimel provides a secure chat enviroment through key based encryption, and can operate with currently existing networks including AIM, MSN, Yahoo,
An MSN Plus script that blocks the messages that contains dangerous links.
MSNCP, a MSN client written on Curses and Python.
Muffinbot is an IRC bot that makes having a bot easy. Muffinbot is simple to install, run, configure, and make work for your purposes. The source and plugins are written in PHP. Muffinbot is configured through either the web or the command line.
PyGtkMSN is an MSN Messenger client, which will support the latest version of the MSN Protocol.
X-MSN, an MSN messenger that is OS independant (coded in Python). It is small, fast, portable and extremely usable while at the same time very elegant GUI - Crystal based themes and great icons! - X-MSN, should be your MSN client!