AIM

Miranda IM is the smaller, faster, easier instant messenger with support for multiple protocols. Designed from the ground-up to be resource efficient while still providing a rich feature set, Miranda …

aMSN is a free open source MSN Messenger clone. aMSN attempts to emulate the look and feel of Windows Live Messenger, and supports many of its features. Offline Messaging Voice …

Miranda New Generation is a successor of a popular multi-protocol instant messaging client for Windows - Miranda IM. Very light on system resources and extremely fast.

Sim-IM is a multiple protocol instant messenger for MS Windows, GNU/Linux, FreeBSD. Sim-IM supports Jabber/XMPP, Google Talk, ICQ and AIM (Oscar), Yahoo! Messenger and Microsoft Messenger (MSN) protocols....

Kopete is an instant messenger supporting AIM, ICQ, MSN, Yahoo, Jabber, IRC, Gadu-Gadu, Novell GroupWise Messenger, and more. It is designed to be a flexible and extensible multi-protocol system suitable …

Slick is a messenger application for mobile devices. It allows you to chat with your friends connected though various online messaging applications. Currently it is still in development, an alpha …

Galaxium is an instant messenger application designed for the GNOME desktop. It will allow you to connect to MSN, Jabber, and IRC. You can communicate with your family, friends and …

emesene is a chat program that allows you to connect to different networks like MSN, Gtalk, Facebook chat, Jabber and others.

Tkabber is a Free and Open Source client for the Jabber instant messaging system. Its writen in Tcl/Tk, and works on many platforms (tested on Linux, FreeBSD, NetBSD, Solaris, MacOS …

Check ReChat (Android messenger): http://refineandroid.doodlekit.com/ - Facebook, Yahoo!®, Google Talk, WLM/MSN, Jabber/XMPP; - group chat (Yahoo!®, Google Talk, WLM/MSN, XMPP); - free voice calls...