aMSN aMSN is a powerful, highly configurable and feature-rich client for the WLM (formerly known as MSN) protocol with support for skins, plugins, system tray integration, webcam, tabbed chat windows, multi-accounts, offline messaging, chat history, display picture and many, many more.
Prpltwtr is a Pidgin (or Empathy) plugin which makes Twitter feel a lot like an IM: you can see yo
Ekiga is an open source SoftPhone, Video Conferencing and Instant Messenger application for Windows and Linux.
I've recently came across a very interesting Banshee extension which I'm sure many of you will find to be useful.
The extension is called Banshee Telepathy Extension and you can use it to share or stream music through Empathy instant messaging client with your contacts (Jabber (including GTalk) only) through a p2p protocol.
Psi is a free, open source instant messaging application designed for the Jabber IM network (including Google Talk) compatible with Windows, Linux and Mac OS X.
If you're tired with the Jabber functionality of Empathy or Pidgin, both lacking lots of important features for this protocol, you should give Psi a try.
If you are using Pidgin and set your status to "Invisible", you aren't actually invisible in GTalk (Google Talk). But thanks to Fahhem's plugin, you can finally set your status to invisible in Gtalk.
Skype 2.1 Beta vor Linux has been released yesterday, bringing a lot of new features, including:
Emesene 1.5 brings a lot of new features and bugfixes, most notable being the webcam (video) support. Changes in 1.5:
* Compatible with the latest Window Live Messenger(tm)
* New plugin set (Plus! colors, Notifications, Mail check, etc.)
* HTTP connection and proxy support
* @msn accounts support
CenterIM is a lightweight IM client for Linux. Actually, CenterIM is very but very lightweight because it runs in a terminal, but still it has almost all the features you may want in a instant messaging client. It supports all the major protocols such as MSN, Yahoo, AIM, IRC, Jabber, etc. and also it has a built-in RSS feed reader.
Pidgin, the well-known multi-protocol and cross-platform instant messaging client does not encrypt archives so everyone can read them if they know where they are placed on your hard drive. And it's quite easy to find them, on Linux they are in:
version 2.5.2 (10/19/2008):
Previously, the way to connect to Twitter using Pidgin (IM client for yahoo, google talk, msn, etc), was to use a jabber account like google chat, then add Twitter. But Twitter shut down the Jabber service. So it doesn’t work anymore. But now, Pidgin-microblog can do the trick.
Pidgin is a multi-protocol Instant Messaging client that allows you to use all of your IM accounts at once.